In plain text emails, the links contain a line break if they become “too long”, which breaks them:
Clicking at them doesn’t lead to the correct question if (part of) the question ID is in the next line:
I think enclosing the URL in Enclosing the URL in angle brackets doesn’t fix this problem (see screenshots above).
> would solve it.
So I guess that line breaks shouldn’t be part of URLs in emails.
I don’t know how long this has been the case. Maybe since:
Word-wrapping plain-text messages at 72 columns?