Can't delete mail from queue which does not route to host

[hostingnuggets]

I am using OpenSMTPD 6.0.2p1 as smart host and have the following mail stuck my queue:

e2355b9a1d9e4851|inet4|mta||@|klikbcabisnis@klikbca.com|klikbcabisnis@klikbca.com|1498116150|1498461750|1498402916|0|inflight|97|

I tried to remove it using:

smtpctl remove e2355b9a1d9e4851

but somehow it re-appears again in the queue. Even more annoying is the following log messages which appear every 15 seconds

Jun 25 17:02:11 smhost smtpd[3122]: smtp-out: Enabling route [] <-> 202.6.210.36 (smtp.klikbca.com)
Jun 25 17:02:12 smhost smtpd[3122]: 2fe76864626d3773 mta event=connecting address=smtp+tls://202.6.210.36:25 host=smtp.klikbca.com
Jun 25 17:02:12 smhost smtpd[3122]: 2fe76864626d3773 mta event=error reason=IO Error: No route to host
Jun 25 17:02:12 smhost smtpd[3122]: smtp-out: Disabling route [] <-> 202.6.210.36 (smtp.klikbca.com) for 15s

So my question here really is how can I get rid of this mail for ever without having to wait the default 4 days of expiring?

Thanks.

[hostingnuggets]

Just a short update, it is now over 5 days that this message is in the queue and I can't get rid of it and neither does it seem to disappear from the queue. After so much time think I don't think this is an expected behavior from OpenSMTPD. I would be glad if someone can look into this and let me know if there is a workaround to get rid of this never ending message in the queue.

[poolpOrg]

The issue has been discussed with @ericfaurot and is well understood:

It is not possible to remove envelopes that are inflight and due to how the MTA currently buffers envelopes, it is possible that an envelope remains inflight for way too long when a route is temporarily invalidated.

We will look into a quick fix though the real fix is known and will be handled as part of #800

[hostingnuggets]

@poolpOrg cheers for the news, looking forward to version 6.4.0 👍

[zoot]

@poolpOrg - may I ask when this bug might be tackled and squashed?

I know it's in the to do list for MTA layer rewrite

I'm revisiting OpenSMTPD for my systems, but realise that this bug was one of my show-stoppers for considering it for production, since one wouldn't be able to clear the queue of spam, or messages injected by rogue email clients in the event of flooding.

[poolpOrg]

The plan is to have the MTA layer rewrite done for the 6.7.0 release.

[dimpase]

I'm on 6.7, and still cannot remove that kind of messages.

[savchenko]

Same here. Is there a way to delete invalid envelopes from the queue while one is experimenting with OpenSMTPd?

[buzmeg]

I'm seeing this issue as well. I can delete the envelopes with "smtpctl remove all" and mailq reports that they're gone. However, if I do "/etc/rc.d/smtpd restart" they all come back.

Thanks.

[ghost]

6.8.0p2-3 and this issue still persist.

[serhanekicii]

7.0, still persist.

[simeonmiteff]

FYI I worked around this by stopping smtpd, finding the message in /var/spool/smtp with grep and deleting the two related files and then restarting smtpd.

[sec]

Can confirm that I also hit this issue using 6.8.0p2,
After removing envelope from queue, it was still trying to deliver, doing restart fixed the issue

May 17 10:35:32 mail smtpd[736]: 3a7b6c4a16fe8b18 mta connecting address=smtp://91.234.194.166:25 host=louiseslaviero.com
May 17 10:35:34 mail smtpd[736]: 3a7b6c485dcbd1b4 mta error reason=IO Error: No route to host
May 17 10:35:34 mail smtpd[736]: smtp-out: Disabling route [] <-> 91.234.194.243 (louiseslaviero.com) for 15s
May 17 10:35:34 mail smtpd[736]: 3a7b6c4b80306f36 mta connecting address=smtp://185.98.128.49:25 host=louiseslaviero.com
May 17 10:35:37 mail smtpd[731]: Exiting
May 17 10:35:37 mail smtpd[61497]: info: OpenSMTPD 6.8.0p2 starting
May 17 10:35:37 mail smtpd[61503]: warn: queue: no return path!
May 17 10:35:37 mail smtpd[61503]: relay: Expire for e5210d4af6eec745: from=<@>, to=<contact@louiseslaviero.com>, rcpt=<->, delay=9d6h18m31s, stat=Envelope expired
May 17 10:37:24 mail smtpd[61513]: info: OpenSMTPD 6.8.0p2 starting