XF 2.1 Problems with eMail notifications and how they are formatted



It happens every now and then that I get an auto-generated email from the forum, which is not displayed correctly.

Some e-mails are correctly formatted and some are not.
I have interviewed different users with various operating systems and I can not find a pattern.

Where can I check these settings - or fix the error in the presentation?

The problem occurs irregularly with current forum software.

edit: This problem occurs even with registration forms, so that some! new registered users cannot validate their eMail-adress

Best regards,

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