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Mail loop

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SuMo Bot
SuMo Bot
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Has anyone received this message or know how to fix the issue that may be causing it?

The reason for the problem: 5.3.0 - Other mail system problem 554-'5.4.14 Hop count exceeded - possible mail loop ATTR34 [BL0GCC02FT003.eop-gcc02.prod.protection.outlook.com]'

Has anyone received this message or know how to fix the issue that may be causing it? The reason for the problem: 5.3.0 - Other mail system problem 554-'5.4.14 Hop count exceeded - possible mail loop ATTR34 [BL0GCC02FT003.eop-gcc02.prod.protection.outlook.com]'

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Matt
Matt
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Duplicated here https://support.mozilla.org/en-US/questions/1378092 Locking this topic