On Thu, 2003-11-13 at 08:26, Bill Mullen wrote: > But there is no such thing as "an email packet," per se - all "vanilla" > SMTP transactions are conducted in plain text. This is why telnet is so > useful as a method to test SMTP servers, because with it you can mimic > what an SMTP client sends *exactly* in all respects. There is AFAIK no way > for an SMTP server to tell whether it is talking to an SMTP client or a > human using telnet (except possibly an absurdly short timeout, enforced > between the first character of a line and the last - as humans type very > slowly, from machines' point of view - but given the lags on the WAN, such > an arrangement would cut off many machines as well, I'd expect).
Yeah, I'm starting to get that. I was reading the smtp rfc and it would seem that one could send all the same commands via telnet. I guess it just seemed like it should be more complicated than that. > > and then with all the recent problems with ddos attacks and virii, etc, > > I would think that they *would* want to seriously filter the headers > > that come in. > > Yes, but it never gets far enough along in the process to allow you to > send it any headers. As has been said, that server appears to be broken. > > > But you guys are saying that the headers on my email - no matter which > > machine I'm sending from - are absolutely normal? Nobody would or could > > do it differently? > > Well, let's not go that far ... :) Darn! :) > I don't have your original post with the two sets of headers in it handy, > but IIRC the SquirrelMail headers identified the sending machine using a > FQDN (and, moreover, one which had a valid rDNS entry), and the Evolution > headers did not. That is a significant difference, and one that *will* > matter to some SMTP servers, when they are deciding whether or not to > accept the mail. It doesn't explain the odd behavior of your boss' system > (as that system never even sees those headers), but it may pose a problem > when sending mail to some other sites. > > I'd say to begin by checking your SquirrelMail config file, located at > /var/www/squirrelmail/config/config.php (if you are using the MDK RPM > version of SquirrelMail), to ensure that you are using the same instance > of Postfix for both methods. If we can rule out a difference in SMTP > servers used, we can narrow the problem down considerably. Here's mine: > > $useSendmail = true; > $smtpServerAddress = 'localhost'; > $smtpPort = 25; > $sendmail_path = '/usr/sbin/sendmail'; > $use_authenticated_smtp = false; > > In my case, both SquirrelMail and Postfix are running on the same box. > That may not be the case in your setup, but what's important here is that > wherever Postix is running, both SquirrelMail and Evolution are using the > same server to send through. I suspect that that's not true here, as that > would be the simplest explanation for the differing headers. > > Including the output of "postconf -n", run on the Postfix box, might be > helpful also, as would the re-inclusion of the two sets of headers; all > that matters is the last couple of "Received:" headers from each message, > as those will be the ones that pertain to your sending system(s). postconf -n alias_database = hash:/etc/postfix/aliases alias_maps = hash:/etc/postfix/aliases command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/lib/postfix debug_peer_level = 2 default_privs = nobody delay_warning_time = 4 mail_owner = postfix mail_spool_directory = /var/spool/mail mailbox_command = /usr/bin/procmail -Y -a $DOMAIN mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man mydestination = $myhostname, localhost.$mydomain $mydomain mydomain = holt-tech.net myhostname = earth mynetworks = 192.168.0.0/24, 127.0.0.0/24 myorigin = holt-tech.net newaliases_path = /usr/bin/newaliases.postfix queue_directory = /var/spool/postfix readme_directory = /usr/share/doc/postfix-1.1.11/README_FILES sample_directory = /usr/share/doc/postfix-1.1.11/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtpd_banner = $myhostname ESMTP $mail_name ($mail_version) (Mandrake Linux) Here was my config.php: $useSendmail = false; $smtpServerAddress = '192.168.0.3'; $smtpPort = 25; $sendmail_path = '/usr/sbin/sendmail'; $use_authenticated_smtp = false; I changed the ip address to 'localhost' and I haven't changed the 'useSendmail' option. Yes, the postfix server and the squirrel server reside on the same box (as does most everything else). Here are the relevant headers: Received: from 4.35.151.34 (EHLO servername) (4.35.151.34) by mta130.mail.sc5.yahoo.com with SMTP; Wed, 12 Nov 2003 12:14:06 -0800 Received: from www.holt-tech.net (unknown [server.internal.ip.address]) by servername (Postfix) with SMTP id 13833205CFC for <[EMAIL PROTECTED]>; Wed, 12 Nov 2003 15:16:15 -0500 (EST) Received: from evrtwa1-ar17-4-35-151-34.evrtwa1.dsl-verizon.net ([4.35.151.34]) (SquirrelMail authenticated user michael) by server.internal.ip.address with HTTP; Wed, 12 Nov 2003 12:16:15 -0800 (PST) ************************************************************************ Received: from 4.35.151.34 (EHLO servername) (4.35.151.34) by mta156.mail.scd.yahoo.com with SMTP; Wed, 12 Nov 2003 12:00:02 -0800 Received: from machinename (unknown [host.internal.ip]) by servername (Postfix) with ESMTP id 0606E205CFC for <[EMAIL PROTECTED]>; Wed, 12 Nov 2003 15:02:11 -0500 (EST) -- Michael Holt Snohomish, WA (o_ [EMAIL PROTECTED] (o_ (o_ //\ www.holt-tech.net (/)_ (/)_ V_/_ www.mandrakelinux.com ==================================================================< SysAdmin excuse #57: Groundskeepers stole the root password
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