Hello Edgar,
I don't relay without authentication except for local networks
Here's my configuration for incomming mails
##################
# INCOMING MAILS #
##################
listen on 127.0.0.1 port 10024 tag CLAM_IN # From Clamav
listen on 127.0.0.1 port 10028 tag DKIM_IN # From dkimproxy
# Reject some domains considered as spam
reject sender <spamdomaines> for any
accept tagged CLAM_IN for domain <domaines> virtual <utilisateurs> deliver to
maildir "/home/mail/%{dest.domain:lowercase}/%{dest.user:lowercase}/Maildir"
accept tagged CLAM_IN for local alias <aliases> deliver to maildir
"/home/mail/%{rcpt.domain:lowercase}/%{dest.user:lowercase}/Maildir"
accept tagged DKIM_IN for any relay via smtp://127.0.0.1:10023
# No authentication for local networks
accept from source <clients> for domain <domaines> relay via
smtp://127.0.0.1:10027
# Accept and relay only if the domain is explicitly specified (file courriels =
@mydomain.org)
accept from any sender !<courriels> for domain <domaines> relay via
smtp://127.0.0.1:10027
The mail header looks like that
Return-Path: [email protected]
...
From: [email protected]
X-Accept-Language: en-us
MIME-Version: 1.0
To: <[email protected]>
The logs like that
Dec 12 23:34:26 ovhegravmx63 smtpd[76185]: e216cee5c463851f mta event=closed
reason=quit messages=0
Dec 12 23:35:52 ovhegravmx63 smtpd[76185]: e216cee6e1356908 smtp
event=connected address=185.48.39.65 host=185.48.39.65
Dec 12 23:35:55 ovhegravmx63 smtpd[76185]: e216cee6e1356908 smtp event=message
address=185.48.39.65 host=185.48.39.65 msgid=e00cc59e
from=<[email protected]> to=<[email protected]> size=4393 ndest=1
proto=SMTP
Dec 12 23:35:55 ovhegravmx63 smtpd[76185]: e216cee9561b88cc mta
event=connecting address=smtp://127.0.0.1:10027 host=localhost
Dec 12 23:35:55 ovhegravmx63 smtpd[76185]: e216cee9561b88cc mta event=connected
Dec 12 23:35:55 ovhegravmx63 smtpd[76185]: e216ceea49112188 smtp
event=connected address=127.0.0.1 host=localhost
Dec 12 23:35:55 ovhegravmx63 dkimproxy.in[9548]: DKIM verify - none;
message-id=<[email protected]>, from=<[email protected]>
Dec 12 23:35:55 ovhegravmx63 smtpd[76185]: e216ceea49112188 smtp event=message
address=127.0.0.1 host=localhost msgid=47085653 from=<[email protected]>
to=<[email protected]> size=4687 ndest=1 proto=ESMTP
Le jeudi 20 décembre 2018 à 04:04:10 UTC+1, Edgar Pettijohn
<[email protected]> a écrit :
On Wed, Dec 19, 2018 at 11:37:31PM +0000, Mik J wrote:
> Hello,
>
> I have wrote rules for my opensmtpd but some spams are passing through.
>
> The ones that I go through have a source like [email protected] and are sent
> to [email protected]
> I'm wondering if some of you have written this kind of rule ?
>
> reject from source !<myallowedclients> sender <mydomains> for domain
> <mydomains>
>
> Regards
Please provide your /etc/mail/smtpd.conf
And perhaps some logs where the spammers are getting through.
You shouldn't allow your server to be used as a relay without authentication.
Edgar
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