andrew.n

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Jun 9, 2020
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Sanal Varghese

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Mar 25, 2022
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Hi sajithgsm,

Headers or other lines in the email may be longer than the character limit which triggers this error.

The issue may be related to sending emails via Outlook. A fix has been published to cPanel version 102.0.2.

Thanks.

Regards,
Sanal Varghese
 

victso

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It appears users moving from v100 to v102.0.8 once again seeing that under certain circumstances outbound email bounces with an error similar to the following:

"1nBxPK-0023Ax-M1 ** [email protected] R=dkim_lookuphost T=dkim_remote_smtp: message has lines too long for transport"

Cpanel's team opened an internal case for their development team to investigate this further. For reference, the case number is CPANEL-40305. Follow this article to receive an email notification when a solution is published in the product.

>>Workaround<<
None at this time

 
Last edited:

cPRex

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There's been a few threads on this so I didn't see this one to mention the update. If you're still seeing the issue, you can adjust that value in WHM >> Exim Configuration editor under the " Maximum line length for SMTP transports (Minimum: 1; Maximum: 65,536)" option.