Lafiel Elentari via Postfix-users:
> In the debug log shows that the connection is established immediately,
> but then there's a pause of several seconds. Only then does send email.
You have a problem with SMTP client hostname lookup;
may 20 21:20:30 mail postfix/smtpd[2501]: connection established
...
may 20 21:20:35 mail postfix/smtpd[2501]: connect from unknown[2a0d:..:a484]
A 5-second delay is typical for a DNS query timing out. Consider
listing the client in /etc/hosts, or, if you are brave, have fun
with networkmanager etc. to fix your DNS infrastructure.
Wietse
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