Hello,
Aqua Mail tries to parse strings like "1.Konzertmeister" in the message header pane within the message subject as URLs resulting in bogus HTTP links launching a web browser when accidently tapped. This happens quite often as people frequently omit a space after a dot. Actually, there are two issues:
1) The parser should react only to valid email addresses and ignore everything else;
2) The subject line should be exempt from parsing entirely as most results are false positives. A collapsed message header pane is very cramped, and filling this small space with long (bogus) links turns it virtually inoperable as the right side has to be avoided due to the star.
The same applies to the message header displayed using View --> Show Message Header. IMVHO the content of the header should not be URL-parsed at all (it was this way some time ago IIRC), as the majority of generated links are useless.
Thanks!