Trisquel mail server is rejecting e-mail altogether (was Forum has started ignoring messages sent by e-mail)

Project:Web
Component:Lists
Category:bug report
Priority:critical
Assigned:david
Status:closed
Description

This bug report was already sent in Spanish one day ago: https://trisquel.info/en/issues/20834

As I have realized that bug reports should be sent in English, I am sending it again and asking admins to close the former bug report in Spanish. Also, I am improving the report here by adding information which allows to determine the moment when the problem started.

The bug happens in the Forum component of the Trisquel website. Up to now, Forum would accept messages two ways: directly at the Forum (logging in), or from e-mail. However, very recently Forum has started ignoring messages sent by e-mail.

Last message I sent to the Forum by e-mail successfully: friday, 26th august 2016 02:38:34 CEST
First message I sent to the Forum by e-mail unsuccessfully: tuesday, 30th august 2016 13:46:56 CEST

Fri, 09/02/2016 - 15:55
Title:Forum has started ignoring messages sent by e-mail» Trisquel mail server is rejecting e-mail altogether (was Forum has started ignoring messages sent by e-mail)
Component:Forum» Lists
Priority:normal» critical

The problem is still going on, and worse that I initially thought.
The reason e-mail messages aren't being delivered to the forum is that they are being rejected altogether by Trisquel SMTP server correo.trisquel.info because of a server configuration problem.
Remember, this problem has been going on uninterruptedly from some point between friday, 26th august 2016 02:38:34 CEST and tuesday, 30th august 2016 13:46:56 CEST. So, the trisquel.info e-mail service and e-mail lists are being deprived from e-mails since at least three full days, maybe up to six days and a half.
I am pasting here the e-mail reports I've been getting.

----- Report 1 start -----
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 24 hours on the queue on ati1-vm.ati.es.

The message identifier is: 1besB2-0005Yo-IT
The date of the message is: Wed, 31 Aug 2016 01:10:46 +0200
The subject of the message is: Re: [Trisquel-usuarios] Experiencia con juegos Trisquel 7.0

The address to which the message has not yet been delivered is:

name at domain
Delay reason: SMTP error from remote mail server after RCPT TO:<name at domain>:
host correo.trisquel.info [5.196.53.144]: 451 4.3.5 Server configuration problem

No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.
----- Report 1 end -----

----- Report 2 start -----
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 24 hours on the queue on ati1-vm.ati.es.

The message identifier is: 1besB8-0005ZD-HT
The date of the message is: Wed, 31 Aug 2016 01:10:52 +0200
The subject of the message is: Re: [Trisquel-usuarios] Experiencia con juegos Trisquel 7.0

The address to which the message has not yet been delivered is:

name at domain
Delay reason: SMTP error from remote mail server after RCPT TO:<name at domain>:
host correo.trisquel.info [5.196.53.144]: 451 4.3.5 Server configuration problem

No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.
----- Report 2 end -----

----- Report 3 start -----
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 48 hours on the queue on ati1-vm.ati.es.

The message identifier is: 1behVI-0002Ui-M9
The date of the message is: Tue, 30 Aug 2016 13:46:56 +0200
The subject of the message is: Re: [Trisquel-usuarios] Motor de bases de datos

The address to which the message has not yet been delivered is:

name at domain
Delay reason: SMTP error from remote mail server after RCPT TO:<name at domain>:
host correo.trisquel.info [5.196.53.144]: 451 4.3.5 Server configuration problem

No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.
----- Report 3 end -----

----- Report 4 start -----
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 48 hours on the queue on ati1-vm.ati.es.

The message identifier is: 1besB2-0005Yo-IT
The date of the message is: Wed, 31 Aug 2016 01:10:46 +0200
The subject of the message is: Re: [Trisquel-usuarios] Experiencia con juegos Trisquel 7.0

The address to which the message has not yet been delivered is:

name at domain
Delay reason: SMTP error from remote mail server after RCPT TO:<name at domain>:
host correo.trisquel.info [5.196.53.144]: 451 4.3.5 Server configuration problem

No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.
----- Report 4 end -----

Fri, 09/02/2016 - 16:04
Assigned to:anonymous» david

Sorry I haven't been available these last days, I'm looking into this issue now. Thanks for reporting!

Fri, 09/02/2016 - 18:47
Status:active» fixed

I think I've fixed the issue, a very old blocklist was set up at the server and it had started to block all incoming email addresses. I've checked now that it works, and previously omitted messages should start to arrive if they haven't yet been bounced back to their senders.

Sorry for the inconvenience, please be sure to reopen this issue if you find it still doesn't work as expected.

Fri, 09/16/2016 - 18:50
Status:fixed» closed

Automatically closed -- issue fixed for 2 weeks with no activity.