On Tue, 10 Sep 2024 10:43:25 +0200
Enrico Morelli via Postfix-users <[email protected]> wrote:

> Dear all,
> 
> I'd installed rspamd as antispam in my postfix mail server.
> Everything seems to work fine except for some users who report a
> problem when trying to send e-mails from an external network. The
> error is: An error occurred while sending mail. The mail server
> responded: Try again later. Please check the message and try again.
> 
> I configured rspamd to disable greylist for email address coming from
> our domain.
> 
> Where can I investigate to solve the problem?
> 

I tried from my phone using 4G network and I see that in postfix log file:


Sep 10 10:45:21 genio postfix/smtpd[2066845]: 7C1CB83872A: 
client=mobiledyn-62-240-135-13.mrsn.it[62.240.135.13], sasl_method=PLAIN, 
[email protected]
Sep 10 10:45:22 genio postfix/cleanup[2066259]: 7C1CB83872A: 
message-id=<[email protected]>
Sep 10 10:45:22 genio postfix/postscreen[625953]: CONNECT from 
[178.77.121.166]:38082 to [150.217.146.39]:25
Sep 10 10:45:22 genio postfix/cleanup[2066259]: 7C1CB83872A: milter-reject: 
END-OF-MESSAGE from mobiledyn-62-240-135-13.mrsn.it[62.240.135.13]: 4.7.1 Try 
again later; from=<[email protected]> to=<[email protected]> proto=ESMTP 
helo=<[100.75.128.253]>
Sep 10 10:45:22 genio postfix/smtpd[2066845]: disconnect from 
mobiledyn-62-240-135-13.mrsn.it[62.240.135.13] ehlo=2 starttls=1 auth=1
mail=1 rcpt=1 data=0/1 quit=1 commands=7/8

-- 
-----------------------------------------------------------
  Enrico Morelli
  System Administrator | Programmer | Web Developer

  CERM - Polo Scientifico
  via Sacconi, 6 - 50019 Sesto Fiorentino (FI) - ITALY
------------------------------------------------------------
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