Hello. On Fri, Dec 10, 2021 at 09:46:37AM +0100, Martin Fischer via Exim-users wrote: > I would need your help. Messages from Exim to some MS 365 accounts hosted in > Europe are bouncing when sent from MS Outlook or an Android client. Sending > same message from Webmail (Roundcube) messages´is delivered but > X-Matching-Connectors header is very big. > > 2021-12-09 14:07:23 1mvK4y-007pOT-RQ <= cont...@atvirtual.nl H=(XXXXX) > [XXXXXXXX]:62544 P=esmtpsa X=TLS1.2:ECDHE-ECDSA-AES128-GCM-SHA256:128 CV=no > A=dovecot_login:cont...@atvirtual.nl S=1216 > id=!&!AAAAAAAAAAAuAAAAAAAAAGMiling04JAkZp
In this line "S=1216" means size of received message. > JJsnUSnoBAMO2jhD3dRHOtM0AqgC7tuYAAAAAAA4AABAAAACL2Fs9vGAsTbjJEYiyeee1AQAAAAA=@atvirtual.nl > T="MS Mail Bounce Report Verification" for postmas...@rico-b.com > 2021-12-09 14:07:23 1mvK4y-007pOT-RQ SMTP connection outbound 1639058843 > 1mvK4y-007pOT-RQ atvirtual.nl postmas...@xxxxxx.xxx Last line is definitely your custom logging, because Exim has no such string in its sources (and the 1639058843 looks as ctime). > 2021-12-09 14:07:25 1mvK4y-007pOT-RQ ** postmas...@xxxx.xxx 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] Finally outlook.com reports 32799 bytes in a single header, while the original mail has size 1216. So your Exim has modified message, probably filling it with some garbage... As you run some customized configuration, your custom code should be inspected for header/body manipulations. -- Eugene Berdnikov -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
