For some reason, the mail for 1 specific mailinglist doesn't get distributed. It worked fine before, and no changes have been made.The mailman3 debug log shows that mailman keeps attempting to distribute the mail.The mailman3 error log show that there is a connection failure to port 25.A tcpdump however shows that there are *NO* further connection attempts on port 25 (postfix) to distribute this mail.Also after stopping and starting mailman3 again, no further connection attempts to the mailserver (postfix) are being made for this mail.Using qfile, the pck file of this mail looks fine. New emails on this specific mailinglist are not distributed either.For all other mailinglists on this server, and which are on the same domain, there are no problems.

Does anyone know how to get this mailinglist functioning properly again, and what is causing this issue?Below are the relevant extracts from the log files for the particular case. mailman smtp.log:  Jan 09 12:00:57 2021 (1571668) Peer: ('127.0.0.1', 51752)Jan 09 12:00:57 2021 (1571668) ('127.0.0.1', 51752) handling connectionJan 09 12:00:57 2021 (1571668) ('127.0.0.1', 51752) Data: b'LHLO ****'Jan 09 12:00:57 2021 (1571668) ('127.0.0.1', 51752) Data: b'MAIL FROM:<****@****>'Jan 09 12:00:57 2021 (1571668) ('127.0.0.1', 51752) sender: *****@*****Jan 09 12:00:57 2021 (1571668) ('127.0.0.1', 51752) Data: b'RCPT TO:<*****@*****>'Jan 09 12:00:57 2021 (1571668) ('127.0.0.1', 51752) recip: ******@********Jan 09 12:00:57 2021 (1571668) ('127.0.0.1', 51752) Data: b'DATA'Jan 09 12:00:57 2021 (1571668) ('127.0.0.1', 51752) Data: b'QUIT'Jan 09 12:00:57 2021 (1571668) ('127.0.0.1', 51752) connection lost... Message has been archived properly, mailmansuite.logINFO 2021-01-09 12:01:00,277 1164814 hyperkitty.views.mailman Archived message <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> to *** mailman error.logJan 09 12:01:00 2021 (1571670) Cannot connect to SMTP server 127.0.0.1 on port 25 mailman debug.log Jan 09 12:00:58 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: validate-authenticityJan 09 12:00:58 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: mime-deleteJan 09 12:00:58 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: taggerJan 09 12:00:58 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: member-recipientsJan 09 12:00:58 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: avoid-duplicatesJan 09 12:00:58 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: cleanseJan 09 12:00:58 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: cleanse-dkimJan 09 12:00:58 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: cook-headersJan 09 12:00:58 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: subject-prefixJan 09 12:00:58 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: rfc-2369Jan 09 12:00:59 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: to-archiveJan 09 12:00:59 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: to-digestJan 09 12:00:59 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: to-usenetJan 09 12:00:59 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: after-deliveryJan 09 12:00:59 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: acknowledgeJan 09 12:00:59 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: dmarcJan 09 12:00:59 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: arc-signJan 09 12:00:59 2021 (1571671) <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com> pipeline default-posting-pipeline processing: to-outgoingJan 09 12:00:59 2021 (1571667) [IncomingRunner] starting oneloopJan 09 12:00:59 2021 (1571667) [IncomingRunner] ending oneloop: 0Jan 09 12:00:59 2021 (1571671) [PipelineRunner] finishing filebase: 1610190058.1544778+e952a743e8df115e8fff9c60f98b189d4800e7e6Jan 09 12:00:59 2021 (1571671) [PipelineRunner] doing periodicJan 09 12:00:59 2021 (1571671) [PipelineRunner] committing transactionJan 09 12:00:59 2021 (1571671) [PipelineRunner] checking short circuitJan 09 12:00:59 2021 (1571671) [PipelineRunner] ending oneloop: 1Jan 09 12:00:59 2021 (1571671) [PipelineRunner] starting oneloopJan 09 12:00:59 2021 (1571671) [PipelineRunner] ending oneloop: 0Jan 09 12:00:59 2021 (1571674) [VirginRunner] starting oneloopJan 09 12:00:59 2021 (1571674) [VirginRunner] ending oneloop: 0Jan 09 12:00:59 2021 (1571669) [NNTPRunner] starting oneloopJan 09 12:00:59 2021 (1571669) [NNTPRunner] ending oneloop: 0Jan 09 12:00:59 2021 (1571675) [DigestRunner] starting oneloopJan 09 12:00:59 2021 (1571675) [DigestRunner] ending oneloop: 0Jan 09 12:01:00 2021 (1571670) [OutgoingRunner] starting oneloopJan 09 12:01:00 2021 (1571670) [OutgoingRunner] processing filebase: 1610190059.1591551+dcfcb22d5156b0a4d4267eabf83c5bb68f945e41Jan 09 12:01:00 2021 (1571670) [OutgoingRunner] processing onefileJan 09 12:01:00 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>Jan 09 12:01:00 2021 (1571664) [ArchiveRunner] starting oneloopJan 09 12:01:00 2021 (1571664) [ArchiveRunner] processing filebase: 1610190059.1079752+2644b9a3eab17d52203a2c2648a1db5ff146eb6dJan 09 12:01:00 2021 (1571664) [ArchiveRunner] processing onefileJan 09 12:01:00 2021 (1571666) [CommandRunner] starting oneloopJan 09 12:01:00 2021 (1571666) [CommandRunner] ending oneloop: 0Jan 09 12:01:00 2021 (1571670) [OutgoingRunner] finishing filebase: 1610190059.1591551+dcfcb22d5156b0a4d4267eabf83c5bb68f945e41Jan 09 12:01:00 2021 (1571670) [OutgoingRunner] doing periodicJan 09 12:01:00 2021 (1571670) [OutgoingRunner] committing transactionJan 09 12:01:00 2021 (1571670) [OutgoingRunner] checking short circuitJan 09 12:01:00 2021 (1571670) [OutgoingRunner] ending oneloop: 1Jan 09 12:01:00 2021 (1571670) [OutgoingRunner] starting oneloopJan 09 12:01:00 2021 (1571670) [OutgoingRunner] processing filebase: 1610190060.1351898+91420b755194277d1236a36b6e2195eff547c8b0Jan 09 12:01:00 2021 (1571670) [OutgoingRunner] processing onefileJan 09 12:01:00 2021 (1571667) [IncomingRunner] starting oneloopJan 09 12:01:00 2021 (1571667) [IncomingRunner] ending oneloop: 0Jan 09 12:01:00 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...Jan 09 12:16:41 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...Jan 09 12:16:41 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...Jan 09 12:16:41 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...Jan 09 12:16:41 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...Jan 09 12:16:41 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...Jan 09 12:16:42 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...Jan 09 12:16:42 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...Jan 09 12:16:42 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...Jan 09 12:16:42 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...Jan 09 12:16:42 2021 (1571670) [outgoing] <function deliver at 0x7f612989dea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>......Jan 09 14:06:30 2021 (1601275) [outgoing] <function deliver at 0x7f038df80ea0>: <91B190F7-EEA3-4FA7-9808-2C35774E665A@gmail.com>...

Thanks in advance,Eric