The mailing list for listmasters using Sympa

["Silvers, Tim" <address@concealed>]

Hi. Isn’t Sympa supposed to keep the digital (SMIME) signatures intact? In 
our environment, it works well with plain text emails, but not for HTML 
formatted messages where recipients see a warning that the original message 
may have been tampered with. However, the cert used to sign the email can be 
checked and it is valid.

Sympa docs confirm that headers/footers are not inserted into signed emails, 
so that isn’t at fault. I tried changing some of the list’s configuration 
options, as well as per subscriber delivery preferences. And I even disabled 
the local spam-scanning (we use ClamAV). But, to no avail in resolving the 
issue.

Any help is appreciated.

Tim

Attachment: smime.p7s
Description: S/MIME cryptographic signature