[awulf]

Shameless plug: My DMARC Checker at https://dmarcchecker.app/ displays a warning message if it encounters a DKIM signature header with an 'l=' tag:

"The 'l=' tag limits how many bytes of the email body are included in the body hash. This may allow an attacker to alter/expand the message in a way that it still passes DKIM validation."

Additionally, the tool alerts you to the use of weak RSA keys or SHA1.

By the way, less than 0.4% of all emails checked make use of the 'l=' tag.

[telesilla]

Dmarcchecker is one of those great things on the internet that you never knew you needed it until you really needed it. Thank you so much for your work on this note project, it's really helpful to us in monitoring our mail security.

[focusedone]

Cool, this is helpful. Thank you!