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Sophos Data Control Rule 552 5.6.0 Headers too large (32768 max)

Sebastian Bertram

Hello, 

we have a problem that some Mails could not delivered to some recipients dut to a large Header. 

Error received 552 5.6.0 Headers too large (32768 max)

The Mails are sent via Office 365 over Transport Rules.

I would like to reduce the Header via a Data Control Rule, but i'am not quiet sure how to setup the Rule. 

I would like to create a rule which is editing header value, but not sure what to enter in value and header attribut.

Any suggestions? 

Thank you



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    Hey hi, you can create a rule to strip unnecessary headers or reduce their size. In the rule, specify the header attribute as content-type and the value as a smaller size, such as text/plain instead of multipart/mixed. 

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    Hey hi, you can create a rule to strip unnecessary headers or reduce their size. In the rule, specify the header attribute as content-type and the value as a smaller size, such as text/plain instead of multipart/mixed. 

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