Out of office email stuck in queue as MSMilter give out a 4.7.1 Service unavailable
jp.methot at planethoster.info
Fri May 5 18:31:42 UTC 2023
I may have found something regarding this.
With debug enabled, I can see in the journalctl logs the following error
every time the server should send me an autoresponse :
SMFIC_MAIL: bad packet
The message then repeat itself every minute or so until I manually
discard messages in the queue, then it doesn't reappear. A google search
for that error message leads me there:
We are indeed working with non-smtp mail in this case, so could it be
hitting a similar bug? What I think could be happening is that postfix
tries to flush its queue every minute or so but can't as it hits this
bug, thus generating a recurring bad packet error in MSmilter.
On 5/4/23 18:16, Shawn Iverson wrote:
> I'm not sure why that is happening and may require setting Debug in
> MailScanner and restarting msmilter to see what is happening via mail
> log or journalctl.
> Another option since that is 127.0.0.1 is to set Milter Ignore
> Loopback = true but I'm not sure you want that behavior since emails
> will bypass MailScanner coming from the localhost.
> On Thu, May 4, 2023, 6:05 PM J-P Methot via MailScanner
> <mailscanner at lists.mailscanner.info> wrote:
> I'm testing Mailscanner 5.3.3 and Postfix 3.6.2. Postfix and
> are on two different servers. Everything works properly, except if
> I set
> an autoresponse in roundcube, the email gets stuck in the postfix
> with a temporary failure message :
> milter-reject: MAIL from localhost[127.0.0.1]: 4.7.1 Service
> - try again later; from=<>
> Postfix has three milter setup : opendkim, opendmarc and MSMilter,
> though that last one is written as an IP + port. If I remove MSMilter
> from the list, the email go through without issue. So what I
> is that the Mailscanner milter is not even accepting my email to
> it, but instead rejecting it with a temporary failure message, as
> if the
> server was greylisted. Yet, nothing inside Mailscanner indicates
> as the email just sits in queue inside postfix on the origin server.
> What could explain this behavior? I've tried setting Treat Invalid
> Watermarks With No Sender as Spam = nothing, but that didn't change
> anything and as far as I'm aware, the email isn't even given a score.
> Jean-Philippe Méthot
> Senior Openstack system administrator
> Administrateur système Openstack sénior
> PlanetHoster inc.
> MailScanner mailing list
> mailscanner at lists.mailscanner.info
Senior Openstack system administrator
Administrateur système Openstack sénior
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