* Wietse Venema wie...@porcupine.org:
out of curiosity and completely ignoring the fact that you probably have
other
things on your mind:
Have you ever had a look at LEMONADE
http://www.lemonadeformobiles.com/index.html and the protocol extensions
it
defines for SMTP (e.g. BURL,
* Fons van der Beek fons.vanderb...@84-it.com:
Hello all,
I have a SBS server that has several users from different domains,
receiving mails for several domains on the SBS box is no problem.
The problem is in sending.
Suppose I use postfix as an outgoing smarthost, but this smart host
* Manish Kathuria mkathu...@tuxtechnologies.co.in:
Is there any content filtering mechanism available using which the outgoing
mails from all the users or selective users are held in a queue, and are
released only after they are examined and approved by the administrator or a
designated person
* Jakob Lenfers lenf...@bigsss-bremen.de:
Hi guys,
I've installed a test mail server to try to connect postfix/cyrus to
ldap. The openldap server runs on another host and is already populated
for a PDC and other services. Cyrus is running and authenticating (with
SASL/PAM) against the LDAP
* Victor Duchovni postfix-users@postfix.org:
On Wed, Sep 30, 2009 at 05:00:46PM +0200, Jakob Lenfers wrote:
Stan Hoeppner schrieb:
Jakob Lenfers put forth on 9/30/2009 5:43 AM:
Stan Hoeppner schrieb:
ldapsource_server_host
http://www.postfix.org/ldap_table.5.html
That
* Jay G. Scott g...@arlut.utexas.edu:
okay, maybe i'm catching on.
i set up the /etc/sasldb2 method of authentication.
that's doing so far what i want.
1. okay, i guess /etc/postfix/sasl_passwd is only for client
security? but why does the client need security? my
* Arora, Sumit sumit.ar...@hp.com:
Can anybody answer my question...
Programming email message is not a Postfix topic.
You will probably get help at a javamail related mailing list.
p...@rick
Thanks
-Original Message-
From: owner-postfix-us...@postfix.org
Everybody seems to use recipient delimiters. I wonder if there's a standard
that specifies a recipient delimiter functionality or did it just appear one
day and people adopted it without a spec or anything.
Anybody knows?
p...@rick
--
All technical questions asked privately will be
* Patrick Ben Koetter p...@state-of-mind.de:
* suomi post...@ayni.com:
Hi listers,
I just can't make postfix change from sasl2 auxprop to sasl2 saslauthd
(with LDAP). postfix never reads /usr/lib/sasl/smtpd.conf.
Postfix on Fedora will not look for smtpd.conf in /usr/lib/sasl
* Wietse Venema wie...@porcupine.org:
Paul Cockings:
This isn't strictly a postfix topic, but this is the best place I know
to find clever people :-)
I'm trying to find a script (sh,bash, perl) that will create a vast
number (100K?) of test emails and store in maildir format.
I'm
* Arora, Sumit sumit.ar...@hp.com:
I have some doubt in receiving email.
Postfix is a SMTP server. It transports (read: sends) messages.
If you want to receive messages you need an IMAP or POP server such as
Dovecot, Courier, Cyrus IMAP or ...
p...@rick
What I understand I just need one
[mailto:owner-postfix-us...@postfix.org] On Behalf Of Patrick Ben Koetter
Sent: Thursday, September 17, 2009 2:18 PM
To: postfix-users@postfix.org
Subject: Re: How to receive email on my postfix server
* Arora, Sumit sumit.ar...@hp.com:
I have some doubt in receiving email.
Postfix is a SMTP
* Arora, Sumit sumit.ar...@hp.com:
Thanks Erwan
As I'm new to postfix I couldn't understand what u said, I googled it but
didn't get any result useful to me.
Have you read man 8 pipe yet?
Can u plz explain with some examples..
You can find some examples in /etc/postfix/master.cf. Look
* Arora, Sumit sumit.ar...@hp.com:
I have done the basic configuration of postfix on my fedora10.
Can anybody tell me where I can see the received emails.
Usually /var/mail/username.
Do I need to setup any database for storing emails?
No.
I just want to be sure that I'm getting emails or
* Stéphane MERLE stephane.me...@distrigame.com:
Patrick Ben Koetter a écrit :
* LuKreme krem...@kreme.com:
I am planning on recompiling postfix and all its various helper apps
(switching from cyrus to dovecot, upgrading mysql, Maybe setting up
LDAP, and doing a clean install of FreeBSD
* LuKreme krem...@kreme.com:
On 13-Sep-2009, at 23:43, Patrick Ben Koetter wrote:
When you move from Cyrus to something else you can't use a file to
file copy
mechanism, since the Cyrus mailbox format is non-standard.
I am not moving from Cyrus to something else. I have Cyrus SASL
* LuKreme krem...@kreme.com:
I am planning on recompiling postfix and all its various helper apps
(switching from cyrus to dovecot, upgrading mysql, Maybe setting up
LDAP, and doing a clean install of FreeBSD latest) onto a newer, and
hopefully more capable machine.
What I want to do is
* Steve Heaven st...@thornet.co.uk:
We have upgraded our system this morning from
postfix 2.2.2
saslauthd 2.1.20
to
postfix 2.3.3
saslauthd 2.1.22
We now find that the sasl realm is not being handled as before.
We use imap authentication and sasl is now trying to make an imap login
* Gaby L g...@autoglobus2000.ro:
I use SASL for remote clients.
What is the best authentication mechanism for SASL security? I use outlook
express clients.
STARTTLS and LOGIN combined give you an encrypted connection and crypted
password storage
NTLM gives you encrypted authentication and
* Victor Duchovni postfix-users@postfix.org:
On Fri, Aug 21, 2009 at 06:02:41AM -0500, Noel Jones wrote:
Florin Andrei wrote:
Is there any magic incantation that needs to be performed to convince
the iPhone to present the certificate to Postfix? The puzzling part is
that it seems to
* Amid Sin amidsin1...@gmail.com:
I'm trying to use postfix for relaying messages from two virtual hosts
on web server to Google Apps. I would like to have emails generated by
each web site to have different originating email addresses so that
any reply messages would go to different
* Stephan A. Rickauer stephan.ricka...@startek.ch:
Hi,
i'd like to protect some internal accounts as described at
http://www.postfix.org/RESTRICTION_CLASS_README.html
Currently, I have the following setup:
smtpd_recipient_restrictions =
reject_unauth_pipelining
* fake...@fakessh.eu fake...@fakessh.eu:
how to have amavisd-new dkimproxy , and implemented
in master.cf and main.cf
Start here:
http://www.ijs.si/software/amavisd/README.postfix.html
p...@rick
--
All technical answers asked privately will be automatically answered on
the list and archived
* Clunk Werclick clunk.wercl...@wibblywobblyteapot.co.uk:
On Mon, 2009-08-03 at 16:08 -0400, Wietse Venema wrote:
Get rid of the backscatter:
http://www.postfix.org/BACKSCATTER_README.html
Wietse
Has anybody implemented something like this with Postfix?
* Ralf Hildebrandt postfix-users@postfix.org:
I meant more what is the Nemesis part. What kind of mail server is that?
I think most if not all smtp servers can customize the banner to say
whatever they want, so you can't really tell anything specific/precise
about a server jujst from
Did anybody ever measure how many clients a Postfix server using Milter can
serve?
Somewhere hidden in my brain I recall someone on the list reporting problems
with Milter under high load. I am wondering how high the load was and if there
was a solution to the problem?
Reason I am asking is: I
* AMP Admin ad...@ampprod.com:
Can anyone tell me what ESMTP (Nemesis). Sorry if this isn't postfix related.
Nemesis is the product name of a SMTP server built by a German provider.
They ran their own system because they couldn't find something that would suit
their needs.
p...@rick
--
All
* Quanah Gibson-Mount qua...@zimbra.com:
--On Tuesday, July 21, 2009 5:44 PM -0400 Linux Addict
linuxaddi...@gmail.com wrote:
Was the postfix compiled with TLS enabled? If yes what does postconf
-d|grep tls_random_source shows?
Yes, it was, and postfix -d shows it not to be set to
* Linux Addict linuxaddi...@gmail.com:
Greetings, I have Two instacnes of postfix running, but all the logs getting
to /var/log/maillog. Could someone please point me on how to create separate
log file for the 2nd instance?
$ man 5 postconf | less +/^syslog_facility
p...@rick
--
All
* Carl A jeptha wispli...@airnet.ca:
Sorry Mr. Tandon,
That uid belongs to amavis and I followed the Postfix setup on the
Ubuntu network.
So a little more understanding please, as I have been thrown in the deep
end with this problem, I do RF for a living, not setting up Postfix
* Wietse Venema postfix-users@postfix.org:
Victor Duchovni:
On Thu, Jul 16, 2009 at 05:21:13PM -0400, Rob Foehl wrote:
Possible substitutes include concierge or valet, or perhaps any of the
less
specific guard, sentry, sentinel, ...
I think sentry is short, and simple, and
* Wietse Venema wie...@porcupine.org:
I'm still open for program name suggestions. If someone has a better
name than swatter or halligan let me know. Once the name changes,
all the configuration parameters will change, too.
prefix? It fixes things before they become a problem...
p...@rick
* tho...@zaph.org tho...@zaph.org:
I have to relay my mail through an SMTP server that uses authentication.
I think I have Postfix configured correctly, but messages I send out get
queued with this error:
90EC0137A88 337 Thu Jul 16 19:12:09 u...@myhostname.foocorp.net
(SASL
* Postfix postfix_l...@ibcnetwork.com:
Hi,
I have a strange problem getting postfix to work with sasl. I am using Debian
Etch.
I have gotten everyting to work fine on a redhat system.
I installed the sasl2- debian packages.
I have compiled with use_sasl_auth use_cyrus_sasl
I have
* Terry L. Inzauro tinza...@ha-solutions.net:
can you elaborate a little more on the postfix - dovecot - ldap setup? is
there a specifc reason why dovecot was used? can courier imap be used?
You may use Cyrus SASL with authdaemond. The authdaemond password verification
service in Cyrus SASL
* Terry L. Inzauro tinza...@ha-solutions.net:
What is the recommended and most scalable method for implementing SMTP Auth
against OpenLDAP that currently manages all IMAP accounts?
Cyrus SASL ldapdb plugin:
The ldapdb auxprop plugin provides access to credentials stored in an
OpenLDAP
* Victor Duchovni postfix-users@postfix.org:
On Mon, Jul 06, 2009 at 09:36:17PM +0200, Patrick Ben Koetter wrote:
* Terry L. Inzauro tinza...@ha-solutions.net:
What is the recommended and most scalable method for implementing SMTP
Auth
against OpenLDAP that currently manages all
* Gerard postfix.us...@yahoo.com:
When sending from my network, I was receiving a warning message:
Jul 5 15:57:06 scorpio postfix/smtpd[22724]: connect from
localhost[127.0.0.1]
Jul 5 15:57:07 scorpio postfix/smtpd[22724]: warning: SASL authentication
failure: no user in db
I was
* Rafał Radecki radecki.ra...@gmail.com:
Hi all. I'm currently installing an smtp server on CentOS 5.3. Part of it is
to use PostgreSQL backend to store virtual users/domains/aliases/passwords
and of course to use it for SASL authentication. My
/usr/lib/sasl2/smtpd.conf file:
* Gerard postfix.u...@yahoo.com:
This is just probably a harmless warning; however, I was wondering how
to make it go away if possible.
I am using 'clamsmtpd' with postfix. I have SASL enabled as well. When
I connect from my MUA, an error message regarding SALA authentication
failure is
* Stefan Förster cite+postfix-us...@incertum.net:
* James Robertson j...@mesrobertson.com wrote:
I decided to write a bash script for extracting recipients from Windows
Active Directory for a Postfix box in front of Exchange.
[...]
$LDAPSEARCH -x -h $LDAPHOST -D $LDAPUSER -w $LDAPPASS -b
I scanned the Postfix documentation for stress_expire_time and could only find
it in master_avail.c, where it is set to 1000s.
So the stress recheck interval is 1000s, correct?
Did I miss that in the official documentation? I believe it should be part of
the official documentation. I can write a
* Zero Zeibov nitrog...@gmail.com:
I try to limit auth mech in postfix 2.6.1 on FreeBSD 6.4. For this
I've added to main.conf:
smtp_sasl_mechanism_filter = plain, login
This does not apply to the SMTP server smtpd, but only to the SMTP client
smtp.
But simple test by telnet shows
* mouss mouss+nob...@netoyen.net:
Sthu Pous a écrit :
Thank You for Your time and answer, Wietse:
Another possiblity is anti-virus software on the sending machine.
I use Linux Debian squeeze/sid - AFAIK I have no any antivirus software.
whatever you use, you have something that
* Janaka Wickramasinghe janakawi...@gmail.com:
Hi All,
I'm new to postfix, I've currently setup the postfix with SMTP AUTH and
it works very well, when I'm sending mails outside of my own domain.
However, when I send a mail to my own domain it doesn't ask for the
authentication
* Michael mich...@networkstuff.co.nz:
Can postfix be set to SMTP auth for outbound mail to specified SMTP servers?
Yes. See smtp_sasl_auth_enable.
p...@rick
--
The Book of Postfix
http://www.postfix-book.com
saslfinger (debugging SMTP AUTH):
Wietse,
a customer asked me to help them customize Postfix replies, so clients
(better: users) can get a hint why their message is being rejected.
The idea is to refer to an URL in the reply where (generic) verbose
explanations on the reject reason can be found. Something along these lines:
* Wietse Venema postfix-users@postfix.org:
a customer asked me to help them customize Postfix replies, so clients
(better: users) can get a hint why their message is being rejected.
The idea is to refer to an URL in the reply where (generic) verbose
explanations on the reject reason can
* Charles Marcus cmar...@media-brokers.com:
On 4/8/2009, mouss (mo...@ml.netoyen.net) wrote:
I'd say go for the popular one: mailman.
The only thing I *don't* like about mailman is it doesn't natively
support virtual domains. It can be made to work, but it requires a lot
of hacking...
* punit jain contactpunitj...@gmail.com:
Hi
I have a requirement where i need to use SMTP AUTH for specific IP addresses
only. As far as i read its applicable for server as a whole. Any ideas ?
Tell more. Your server should only use SMTP AUTH when it authenticates with
other specific IP
* Jeff Huang jbhu...@scut.edu.cn:
OK,Thanks.
I'll try cyrus imap.
Now I use Courier-imap as my imap/pop3 server.
Try dovecot IMAP. It indexes maildir and fixes the index automatically. Cyrus
IMAP doesn't ...
p...@rick
--
All technical answers asked privately will be automatically
* LuKreme krem...@kreme.com:
On 17-Mar-2009, at 13:45, Patrick Ben Koetter wrote:
smtpd_sasl_security_options = noplaintext, noanonymous
smtpd_sasl_tls_security_options = noanonymous
As for the PAM part in the sasl authentication, start saslauthd like
this:
saslauthd -a pam -m /path
* LuKreme krem...@kreme.com:
On 18-Mar-2009, at 02:38, Patrick Ben Koetter wrote:
* LuKreme krem...@kreme.com:
path to which socket there?
$ ls -ls /var/run/saslauthd/
total 2
0 srwxrwxrwx 1 root postfix 0 Mar 17 03:52 mux
mux it is.
Starting saslauthd.
saslauthd[91067] :main
* LuKreme krem...@kreme.com:
OK, first question is will I be able to setup smtpd.conf so that it will
support MULTIPLE authentication methods (sql and PAM)? But first, to get
it working.
I am running on a custom port right now to avoid mucking with 587 until
everything is working:
2525
* LuKreme krem...@kreme.com:
On 17-Mar-2009, at 03:15, Patrick Ben Koetter wrote:
* LuKreme krem...@kreme.com:
OK, first question is will I be able to setup smtpd.conf so that it
will
support MULTIPLE authentication methods (sql and PAM)? But first, to
get
it working.
I am running
* LuKreme krem...@kreme.com:
On 17-Mar-2009, at 11:47, Andreas Winkelmann wrote:
On 17-Mar-2009, at 03:49, LuKreme wrote:
I've made sure that /var/run/saslauthd/ is owned by root:postfix (it
was root:mail) and have removed the authdaemon_path line and am
trying again. Hopefully this was it.
* KLaM Postmaster postmas...@klam.ca:
I am thinking of switching to Ubuntu 8.10 LTS server, however when I
look at the Postfix configuration it seems somewhat odd.
I don't want to start a flame war, but I would like to hear what people
think about things like dynamicmaps and other oddities of
* Rich rhd...@gmail.com:
Do you know of any script/software that has been written to be that glue
you speak of?
Any objections to query LDAP directly using saslauthd -a ldap -O
/etc/saslauthd.conf?
p...@rick
On Fri, Feb 27, 2009 at 4:35 PM, Victor Duchovni
* Zoltan Balogh zee.bal...@gmail.com:
Hello All,
I work on a project where we annotate emails coming through a mail server.
By annotation I mean attaching additional possibly useful information to
email body based on the email content. Annotation is enacted selectively
based on users
* Tolga to...@ozses.net:
Here's your error: unable to verify the first certificate. Did you add your
CA certificate to your CA certificate store ca-bundles.crt (in your case)?
p...@rick
I just did that, restarted postfix, and when I did an openssl s_client
-starttls smtp -CAfile
* Eduardo Costa rap...@ipb.pt:
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Hi everyone,
how can I take control of quota in the field mailQuotaSize using postfix?
You can't with Postfix. Postfix LDAs don't support quotas.
Use Dovecot's deliver LDA or maildrop if you use Courier or ...
* Tolga to...@ozses.net:
I am reading The Book of Postfix, I applied the steps CA.pl -newca, openssl
req -new -nodes -keyout privatekey.pem -out privatekey.pem -days 1825 and
openssl ca -policy policy_anything -out publiccert.pem -infiles
privatekey.pem , copied the key and cert under
* Tolga to...@ozses.net:
On Thu, Feb 05, 2009 at 04:25:50PM +0100, Patrick Ben Koetter wrote:
* Tolga to...@ozses.net:
I am reading The Book of Postfix, I applied the steps CA.pl -newca,
openssl
req -new -nodes -keyout privatekey.pem -out privatekey.pem -days 1825 and
openssl ca
* David Bishop t...@gnuconsulting.com:
On Wed, Feb 04, 2009 at 07:31:23AM +0100, Martin Schmitt wrote:
David Bishop schrieb:
What are my options? I don't have a lot of experience with dovecot (it's
been a few years for me) and thus don't really know anything about its
SASL
* Udo Rader list...@bestsolution.at:
Hmm, I've never heard of dovecot being able to deal with non-plaintext
passwords in connection with SASL. Are you sure that that can be done
without patching?
I haven't used Dovecot like that myself, but the documentation indicates you
can set a
]
On Tue, Feb 3, 2009 at 4:08 PM, Patrick Ben Koetter
p...@state-of-mind.dewrote:
* punit jain contactpunitj...@gmail.com:
Hi All,
I have a mailserver which is getting abused by spammers. It is right now
an
open relay and has been blocked by major sites
* punit jain contactpunitj...@gmail.com:
Hi All,
I have a mailserver which is getting abused by spammers. It is right now an
open relay and has been blocked by major sites.
naughtygoo...@yahoo.in
(host f.mx.mail.yahoo.com[209.191.88.247] refused to
* MountainX d...@davestechshop.net:
I did chmod 600 on sasl_passwd. Do I need to do the same to sasl_passwd.db?
Thanks
Delete sasl_passwd.db and recreate it using the postmap command. The postmap
command honours permissions.
p...@rick
-
http://davestechshop.net blog
--
View
John,
* swilting john.swilt...@wanadoo.fr:
I also like the problem and I do not know how to create the database
sasl2.db all the best
your problem is probably not a Postfix problem, but a SASL problem.
The saslpasswd2 command usually takes care of sasl2.db.
p...@rick
--
The Book
* Jordi Espasa Clofent jespa...@minibofh.org:
Hi all,
I want to the authenticated users (who are authenticated using SASL2 and
SQL backend) don't pass to several filters detailed in master.cf file;
on the other hand, I want to still using the same filter for all the
remain world.
My
* Res r...@ausics.net:
We will install new servers to improve performance in our structure.
Currently many accounts receiving more then 5000 msgs./hour.
Two MX Postfix, two IMAP servers and more two servers with
Spamassassin, Clamav,...
Which is the best option of IMAP server to few
Maps in $relay_recipient_maps are evaluated as lists - only the LHS is
examined to determine if a recipient is listed and therefore a valid
recipient.
Does the same apply for local_recipient_maps, virtual_alias_maps and
virtual_mailbox_maps when Postfix tries to determine if a given recipient is
* Victor Duchovni postfix-users@postfix.org:
...
Sending them off to a LMTP server is a transport map job:
recipi...@example.com lmtp:localhost
The correct syntax (if the default port is OK) is:
recipi...@example.com lmtp:inet:localhost
Maybe its just me, but I had
* Payne pa...@magidesign.com:
I am a bit slow on this, I got a client that won't let me change the way
mail working, but they want me to set up SMTP Authentication. How can I
They want your mailserver to send SMTP Authentication data to their server?
do it so it work without cyrus or
I was looking for a (current) RFC section that says SMTP servers MUST accept
messages sent by the null sender , but almost all I found were references
that say notifications MUST be sent as null sender.
That in turn might mean a server must accept such senders, but I'd rather see
that written
* kj [EMAIL PROTECTED]:
Victor Duchovni wrote:
On Mon, Oct 27, 2008 at 07:50:07PM +, kj wrote:
Next edition of which book?
Ralph and Patrick's book :)
The Book Of Postfix: http://www.postfix-book.com
We are working on a new edition as I write. Yet, things are still in a fragile
* Vince LaMonica [EMAIL PROTECTED]:
First off the problem: setting up a new server with Ubuntu 8.04; hand
compiling everything. Old server was Ubuntu 6.06 with hand-compiled
Postfix 2.4.6. For the new server, I did a fresh install of 2.5.5.
Apparently I'm missing something in the release
* Vince LaMonica [EMAIL PROTECTED]:
[i wrote:]
} /etc/default/saslauthd:
}
} START=yes
} DESC=SASL Authentication Daemon
} NAME=saslauthd
} MECHANISMS=shadow
} MECH_OPTIONS=
} THREADS=5
} OPTIONS=-c -m /var/spool/postfix/var/run/saslauthd
} You are not running postfix
* Travis [EMAIL PROTECTED]:
On Fri, Oct 10, 2008 at 03:43:09PM -0500, Travis wrote:
Closer... now Thunderbird prompts for my password over and over, but I've
set it properly.
What's the meaning of:
Oct 10 22:40:55 lexus postfix/smtpd[13983]: warning: SASL authentication
failure:
that are used in
combination with those backends and what these mechanisms require.
[EMAIL PROTECTED]
I am running MailScanner, Postfix, Spamassassin.
Patrick Ben Koetter wrote:
* Lists [EMAIL PROTECTED]:
Hi Patrick,
I want a single username and password to be used for all people
all clients support an
optional switch that will let the client reuse these credentials for SMTP
Authentication.
Use the same password backend for SMTP/POP/IMAP.
[EMAIL PROTECTED]
Kate
Patrick Ben Koetter wrote:
* Lists [EMAIL PROTECTED]:
Not sure if this is the right place to post
* Marcel Grandemange [EMAIL PROTECTED]:
However had one problem.
you have two problems. ;)
Please follow these instructions to get advice on the list:
http://www.postfix.org/DEBUG_README.html#mail
[EMAIL PROTECTED]
--
All technical answers asked privately will be automatically answered on
* Stefan Palme [EMAIL PROTECTED]:
Hi all,
when postfix creates a bounce message, a Delivery report will be
attached describing the problem.
Is it possible to modify the format of this delivery report,
e.g. adding a line to it?
http://postfix.state-of-mind.de/bounce-templates/index.html
* John Baker [EMAIL PROTECTED]:
Hi,
I user reported mail not getting to him from somebody and I found this
in the log:
NOQUEUE: reject: RCPT from bmmail.cwf.org[216.54.2.34]: 504 doorway3:
Helo command rejected: need fully-qualified hostname;
from=[EMAIL PROTECTED] to=[EMAIL
* punit jain [EMAIL PROTECTED]:
HI All,
I have postfix server running and have configured sasl. I have configured
SASL but i could see : -
telnet 0.0.0.0 25
Trying 0.0.0.0...
Connected to 0.0.0.0.
Escape character is '^]'.
220 mail.example.com ESMTP Postfix
ehlo irfan
* Ethariel [EMAIL PROTECTED]:
Hello Ville,
understanding with some difficulty :-) is LDAP. I have two questions:
those of you who use LDAP as a back-end, what tools do you use to
manage the entries, and what schema do you use to store Postfix
(including virtual domain) account info? For
* Wietse Venema [EMAIL PROTECTED]:
Patrick Ben Koetter:
A reasonable setting is:
smtpd_sasl_security_options = noanonymous
This allows any available mechanism except for anonymous, as it is highly
exploitable in the context of SMTP. (It's usable in the context of FTP or
IMAP
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