Mails from cPanel to MS Office365 - Exchange Online

davorg

• November 08, 2021 07:42

When sending to some users, which are using Office365 in MS cloud I got delivery error and returned message: SMTP error from remote mail server 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. [AM6PR02CA0017.eurprd02.prod.outlook.com] [VI1EUR05FT026.

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  lautrivtas

  • December 10, 2021 07:54

  Here same issue. Did you sort it out meanwhile? Sending from a client (PC or smartphone) message is bouncing, sending same message form webmail, mssage is delivered, but X-Matching-Connectors is very large.

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  davorg

  • December 12, 2021 20:07

  Hi, I have resolved this issue and has nothing with cPanel. I'm using GpGSuite with Mail on macos and there is an error in latest version. Look at this URL GPGMail and Thunderbird / Feedback / Discussion Area - GPGTools Support and download this hotfix

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