Connection reset

[mwanza_k]

Hi good people

I have been struggling with this error "Stat=Deferred: Connection reset by *****.com (Reason:451 4.4.1 reply: read error from *****.com)" for quite sometime, unit is FortiMail VM08, note this only happens when i send to certain domains, any help with this will be greatly appreciated.

[marchand]

If you haven't already checked, see if your ip is not blacklisted

[link]http://www.anti-abuse.org/multi-rbl-check/[/link]

[mwanza_k]

Hi, thanks for the response, funny thing the i.p isnt blacklisted

[marchand]

Are you sure the problem is related to fortimail  ?

If you send mails without using fortimail, everything works ok ?

[mwanza_k]

when we bypass fortimail, emails go through

[marchand]

I think you should also check if the mail server reports any configuration errors .

https://mxtoolbox.com/diagnostic.aspx

[abelio]

mwanza_k wrote:

Hi good people

I have been struggling with this error "Stat=Deferred: Connection reset by *****.com (Reason:451 4.4.1 reply: read error from *****.com)" for quite sometime, unit is FortiMail VM08, note this only happens when i send to certain domains, any help with this will be greatly appreciated.

4xx error code are designed for temporary errors

Maybe is only greylisting feature enabled and not a 'problem'

You should check your logs deeply; use cross  search feature with right button over specific log line.