Bernhard Bleier via Postfix-users:
> Hello,
>
> we deploy an application (it is also able to send mail). SMTP server is
> provided in application config. SMTP server is Postfix (running on localhost).
>
> Postfix is okay and is live. However, some mails are not delivered while
> there is no error logged (neither in application, nor in Postfix).
> Likely the mails do not even reach Postfix.
>
> The vendor states the following (please see below).
> Same time vendor cannot say anything about Postfix - can you perhaps guess
> which specific configuration parameter should be checked to achieve what they
> say?
>
> ---8<---
> To guarantee proper email sending, make sure that the mail server timeout
> exceeds the application timeout for mail server connection.
>
> Application TTL < Mail Server TTL
> --->8---
Postfix logs all problems. If the mail sending application does
not log all problems, then talk to their support people.
The Postfix SMTP server logs all connection timeouts like this:
timeout after xxx from yyy[zzz]
timeout after DATA (xxx bytes) from [yyy[zzz]
If there are no such events logged, then changing Postfix time
limits will not make a difference.
Another possibility is that the client makes so many SMTP connections
in parallel that all Postfix SMTP servers are busy. Postfix will
log that as
warning: service "xxx" (yyy) has reached its process limit "zzz":
new clients may experience noticeable delays
This can be addressed by application or Postfix configuration.
I'm not going to dunmp out all the possible solutions. You need
to determine what the problem is.
Wietse
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