Some E-Mails sent from osTicket to e-mail adresses won't get delievered. There is an NDR comming back sent from Microsoft, containing the following information:
Your message contains invalid characters (bare line feed characters) which the email servers at xy.com don't support.

Error Details
Reported error: 550 5.6.11 SMTPSEND.BareLinefeedsAreIllegal; message contains bare linefeeds, which cannot be sent via DATA and receiving system does not support BDAT
For more information see Fix email delivery issues for error code 5.6.11 in Office 365

Is there any setting or fix available? It's critical for our business because customers aren't happy when they don't receive our mails.

We use o365 and have not had any issues with this.
First thing I would recommended is that you upgrade to current and re-test.

Hello everyone,

How can I further investigate this error and find a solution for this issue?
I would be happy if someone has appropriate troubleshooting steps to deal with this type of issues.

6 months later

Hello,
Do you have a solution? I have the same problem.

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