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From: Marshall Lake on 4 Jun 2010 18:41

I've been trying to resolve this issue long enough that I'm becoming
tired and confused. Hopefully someone can help me and/or explain to me
what's going on.

I'm running an email server using exim v4.69 on Debian 5.0.0 with a
hostname of es. The domain name is <mydom.net>. The server supports both
individual users and mailing lists (using Mailman v2.1.11). The From:
line of outgoing emails (whether it comes from a user or a mailing list)
is always <@es.mydom.net> (verified with exim -brw). This has always
worked fine until ...

A short while ago my ISP blocked port 25. Rather than fight with my ISP
I purchased no-ip.com's Reflector service. Now, all email addressed to
mydom.net arrives at my mail server via no-ip.com on a port other than 25.

Now any response to a post to a mailing list by a user outside the
mydom.net domain is not being delivered because the To: line of the
response contains list(a)es.mydom.net and delivery is attempted through
my ISP. However, responses to emails sent by individual users are being
delivered fine because the To: line contains user(a)mydom.net and delivery
is made through <no-ip.com>.

I do not understand why the To: line of responses to emails coming from
individuals and emails coming from mailing lists should be different.

I suppose the best way to correct this situation is to rewrite the From:
line of all outgoing emails from @es.mydom.net to @mydom.net but I cannot
see how.

Any help and/or explanation is appreciated.

From: Marc Haber on 5 Jun 2010 11:31
Marshall Lake <fa-q(a)NS.net> wrote:
>I do not understand why the To: line of responses to emails coming from
>individuals and emails coming from mailing lists should be different.

The To: line of a message is irrelevant for SMTP delivery. Sender and
Recipient are transported out-of-band in the SMTP envelope.

Greetings
Marc
--
-------------------------------------- !! No courtesy copies, please !! -----
Marc Haber | " Questions are the | Mailadresse im Header
Mannheim, Germany | Beginning of Wisdom " | http://www.zugschlus.de/
Nordisch by Nature | Lt. Worf, TNG "Rightful Heir" | Fon: *49 621 72739834
From: J G Miller on 5 Jun 2010 17:05
On Fri, 04 Jun 2010 22:41:10 +0000, Marshall Lake wrote:

> I suppose the best way to correct this situation is to rewrite the From:
> line of all outgoing emails from @es.mydom.net to @mydom.net but I
> cannot see how.

Outgoing email messages can easily have their From field and other appropriate
field rewritten using the email-addresses file mechanism in the appropriate
transport sub-section.

For example --

remote_smtp_smarthost:
driver = smtp
debug_print = "Transport: remote_smtp_smarthost for $local_p
art@$domain"
headers_rewrite = CHECK_HEADERS_REWRITE \
${lookup{$1}lsearch{CONFDIR/email-addresses}{$
value}fail}
hosts_try_auth = <; \
${if exists{CONFDIR/passwd.client}\
{${lookup{$host}nwildlsearch{CONFDIR/pas
swd.client}{$host_address}}}\
{}}
return_path = ${if match{$return_path}{CHECK_RETURN_PATH}\
{${lookup{$1}\
lsearch{CONFDIR/email-addresses}{$value}
fail}}\
fail}
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