Author: Jeremy Harris Date: To: exim-users Subject: Re: [exim] MS 365 "X-Matching-Connectors" header bounce error
On 10/12/2021 08:46, Martin Fischer via Exim-users wrote: > 2021-12-09 14:07:25 1mvK4y-007pOT-RQ **postmaster@??? R=dkim_lookuphost T=dkim_remote_smtp H=xxxxxx01b.mail.protection.outlook.com [104.47.17.138] X=TLS1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=yes: SMTP error from remote mail ser
> ver after end of data: 554 5.6.211 Invalid MIME Content: Single text value size (32799) exceeded allowed maximum (32768) for the 'X-Matching-Connectors' header. [VI1PR0202MB2528.eurprd02.prod.outlook.com] [AS9PR06CA0096.eurprd06.prod.outl
> ook.com] [VI1EUR05FT058.eop-eur05.prod.protection.outlook.com]
This looks like a client MUA problem, and not Exim. Exim in general does
not modify message bodies, and that error from the xxxxxx01b.mail.protection.outlook.com
site that Exim is trying to send to:
Invalid MIME Content: Single text value size (32799) exceeded allowed maximum (32768) for the 'X-Matching-Connectors' header. [VI1PR0202MB2528.eurprd02.prod.outlook.com] [AS9PR06CA0096.eurprd06.prod.outl > ook.com] [VI1EUR05FT058.eop-eur05.prod.protection.outlook.com]
reads like it's complaining about the message body to me. So I think you need to
investigate your Roundcube. It is all messages from there, or some subset you
can characterize?
--
Cheers,
Jeremy
