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Mails signed in Outlook do not work
Problem reported by Oliver - Today at 11:44 AM
Submitted
Hello,

since version 8965 the problem is that mails signed with S/MIME in Outlook arrive at the recipient with the following error “The digital signature of this message is invalid or untrusted”.

After some tests I noticed that Outlook writes the content Content-Type: in two lines. SM changes this to one line and this is where the error comes from.

This error does not occur when sending via em-Client, as this writes the Content-Type content in one line.

Since I can't get any further with the support, my question is whether others here in the forum have observed the same problem.

My configuration: Windows Server 2022 (German), SM Server Version 9091, Outlook 2021 (German), Outlook 365 (English), IMAP and MAPI connection

Best regards
Oliver
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