Thank you very much for explaining, everyone. Changing myhostname did
indeed fix the problem. Using a subdomain with FQDN is a solution that
didn't occur to me. Even the transport_maps value wasn't needed.
All the best,
Sam
On 16/07/2024 13:27, Matus UHLAR - fantomas via Postfix-users wrote:
Samer Afach via Postfix-users:
postfix/smtp[299]: C0A3C9F906D0: to=<u...@example.com>,
relay=10.10.100.100[10.10.100.100]:25, delay=957,
delays=950/0.02/6.4/0,
dsn=5.4.6, status=bounced (mail for 10.10.100.100 loops back to
myself)
postfix produces this error when if finds mail is directed to itself, but
does not know what to do in such mail.
Domain example.com must be in mydestination in order for it to be local,
relay_domains in order to be remote etc:
http://www.postfix.org/ADDRESS_CLASS_README.html
Since you want example.com to be routed somewhere, it apparently
belongs to relay_domains,
On 16/07/2024 01:04, Wietse Venema wrote:
And that comes after these warnings:
postfix/smtp[289]: warning: host 10.10.100.100[10.10.100.100]:25
greeted
me with my own hostname example.com
postfix/smtp[289]: warning: host 10.10.100.100[10.10.100.100]:25
replied
to HELO/EHLO with my own hostname example.com
So give Postfix a proper hostname instead of the mail domain (and
stop ignoring Postfix warning messages).
On 16.07.24 10:00, Samer Afach via Postfix-users wrote:
Thank you. If I may ask a question related to why I did this, would
using a different myhostname not cause a problem? Both are supposed
to be for example.com because they handle emails for example.com, one
for receiving and one for sending. The docs do specify to use an
FQDN, that's why I ignored the warning. Do I have the liberty of
calling each machine whatever I want in myhostname? What's the right
way to do this?
I understand this as safety measure to avoid mail loops when sending
mail to server that has the same hostname as postfix.
Having different hostnames also helps tracking issues with e-mail -
you can see in Received: headers where the mail went through.
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