Truncated display of the mail message

If this content is present in the html message:

 <a href="mailto:pippo@domain.tld?">pippo@domain.tld?</a>

the display of the message is truncated and the rest of the content present in the source is not shown.

Note:
the matcher that tries to translate the mailto into a "new message" action and if there is a "?" also look for the parameters, but the parameters are not there.

(Internal Ref: #86928)