Joey J via Postfix-users:
> In: DATA
> Out: 354 End data with <CR><LF>.<CR><LF>
> Out: 451 4.3.0 Error: queue file write error
This SMTP transcript was sent to you by a Postfix smtpd process.
The file write error may have been logged by that process, or by a
Postfix cleanup process.
You should be able to correlate the client IP address and date/time
in the above email message Subject: and Date: headers, with the IP
address and time stamps in Postfix logging.
Joey J via Postfix-users:
> Thanks everyone, it may be the filtering process as mentioned. This is a
> Proxmox Mail Gateway running Postfix.
> I do see these type of errors but will look at more details based on
> everyone's suggestions and then report back.
>
> 2023-09-26T21:34:00.391589-04:00 mgw postfix/postscreen[469237]: COMMAND
> PIPELINING from [208.99.44.83]:42906 after RCPT: DATA\r\nQUITE\r\n
This is a different problem. The "COMMAND PIPELINING" means that
the SMTP client sends commands without waiting for Postfix to
respond. Also, the QUITE after DATA does not look right.
You probably should not be using the postscreen 'after greeting'
pipelining etc. tests. You can turn them off with:
$ postconf postscreen_bare_newline_enable=no \
postscreen_non_smtp_command_enable=no \
postscreen_pipelining_enable=no
Wietse
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