Wietse Venema via Postfix-users:
> 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
The connections from 208.99.44.83 (api4.doctorpacket.com) appear
to be generated by a server monitoring system. If that is the case,
then I suggest that you find a monitoring service that speaks SMTP
without making mistakes.
Wietse
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