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Mailserver refusing emails sent through VRTS due to too large headers
Open, LowPublicBUG REPORT

Description

Steps to replicate the issue (include links if applicable):

  • Open Ticket#2024111610004276 (located in the permissions-nl:wikiportret queue of the VRTS system).
  • Try to resend the answer prepared in article 3 of the ticket.
  • The previous step results in the recieving mailserver returning the error message mentioned below.

What happens?: When responding to the enquiry mentioned in Ticket#2024111610004276, the receiving mailserver rejects the sent (standard) response, effectively halting the handling of this ticket. The received error message is Headers too large (32768 max), with further information reading Remote server returned '552 5.6.0 Headers too large (32768 max)'. Please note that the full diagnostic information cannot be pasted here as long as the ticket is public for confidentiality reasons. It is available in the VRTS system (as Ticket#2024111610004276 ).

What should have happened instead?: Evidently, the response should have been sent to the receiver with headers not leading to this problem.

Event Timeline

@jhathaway do you think this is a VRTS problem or an MX problem?

From my initial read of one of the rejected emails, I think the problem is on the recipient end. The email gets caught in some type of routing loop:

Received: from AS9P250CA0007.EURP250.PROD.OUTLOOK.COM (2603:10a6:20b:532::8=
Received: from AMS0EPF000001AE.eurprd05.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05=
Received: from DB9PR01CA0023.eurprd01.prod.exchangelabs.com
Received: from DB1PEPF000509F7.eurprd02.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05=
Received: from DU2PR04CA0327.eurprd04.prod.outlook.com (2603:10a6:10:2b5::3=
Received: from DB1PEPF000509E7.eurprd03.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05=
Received: from AS4P251CA0006.EURP251.PROD.OUTLOOK.COM (2603:10a6:20b:5d2::1=
Received: from AMS0EPF000001A8.eurprd05.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from PA4PR04CU001.outbound.protection.outlook.com (mail-francecen=
Received: from DB8PR06CA0048.eurprd06.prod.outlook.com (2603:10a6:10:120::2=
Received: from DB1PEPF000509E3.eurprd03.prod.outlook.com
Received-SPF: Pass (protection.outlook.com: domain of wikimedia.org designa=
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from mx-out1001.wikimedia.org (mx-out1001.wikimedia.org [208.80.1=
Received: from vrts1003.eqiad.wmnet (vrts1003.eqiad.wmnet [IPv6:2620:0:861:=
Received: from otrs by vrts1003.eqiad.wmnet with local (Exim 4.96)
Received: from AS9P250CA0007.EURP250.PROD.OUTLOOK.COM (2603:10a6:20b:532::8=
Received: from AMS0EPF000001AE.eurprd05.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05=
Received: from DB9PR01CA0023.eurprd01.prod.exchangelabs.com
Received: from DB1PEPF000509F7.eurprd02.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05=
Received: from DU2PR04CA0327.eurprd04.prod.outlook.com (2603:10a6:10:2b5::3=
Received: from DB1PEPF000509E7.eurprd03.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05=
Received: from AS4P251CA0006.EURP251.PROD.OUTLOOK.COM (2603:10a6:20b:5d2::1=
Received: from AMS0EPF000001A8.eurprd05.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from PA4PR04CU001.outbound.protection.outlook.com (mail-francecen=
Received: from DB8PR06CA0048.eurprd06.prod.outlook.com (2603:10a6:10:120::2=
Received: from DB1PEPF000509E3.eurprd03.prod.outlook.com
Received-SPF: Pass (protection.outlook.com: domain of wikimedia.org designa=
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from mx-out1001.wikimedia.org (mx-out1001.wikimedia.org [208.80.1=
Received: from vrts1003.eqiad.wmnet (vrts1003.eqiad.wmnet [IPv6:2620:0:861:=
Received: from otrs by vrts1003.eqiad.wmnet with local (Exim 4.96)
Received-From-MTA: dns;mx1.ajax.nl
Received: from AS9P250CA0007.EURP250.PROD.OUTLOOK.COM (2603:10a6:20b:532::8)
Received: from AMS0EPF000001AE.eurprd05.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05lp2110.outbound.protection.outlook.com [104.47.17.110])
Received: from DB9PR01CA0023.eurprd01.prod.exchangelabs.com
Received: from DB1PEPF000509F7.eurprd02.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05lp2104.outbound.protection.outlook.com [104.47.18.104])
Received: from DU2PR04CA0327.eurprd04.prod.outlook.com (2603:10a6:10:2b5::32)
Received: from DB1PEPF000509E7.eurprd03.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05lp2111.outbound.protection.outlook.com [104.47.17.111])
Received: from AS4P251CA0006.EURP251.PROD.OUTLOOK.COM (2603:10a6:20b:5d2::15)
Received: from AMS0EPF000001A8.eurprd05.prod.outlook.com
Received-SPF: SoftFail (protection.outlook.com: domain of transitioning
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from PA4PR04CU001.outbound.protection.outlook.com (mail-francecentralazlp17013074.outbound.protection.outlook.com [40.93.76.74])
Received: from DB8PR06CA0048.eurprd06.prod.outlook.com (2603:10a6:10:120::22)
Received: from DB1PEPF000509E3.eurprd03.prod.outlook.com
Received-SPF: Pass (protection.outlook.com: domain of wikimedia.org designates
Received: from mx1.ajax.nl (52.174.88.204) by
Received: from mx-out1001.wikimedia.org (mx-out1001.wikimedia.org [208.80.154.5])
Received: from vrts1003.eqiad.wmnet (vrts1003.eqiad.wmnet [IPv6:2620:0:861:102:10:64:16:124])
Received: from otrs by vrts1003.eqiad.wmnet with local (Exim 4.96)

The mail servers keep adding headers in the loop, until they exceed the allowable size. So I don't think there is much we can do on our side, except notify their postmaster.

I notified their postmaster, I'll update if I receive a reply.

@jhathaway: Did you receive some reply from their postmaster?