here we set $m->use_entities to 1
and set $m->MailtoTextSeparator to <!-- bingo -->
(this is an idea from M. Schaedler)

here we set $m->use_entities back to 0 again

and here a long email address is cut with MaxStrlen = 34
it is not recommended to use this in combination with
a long MailtoTextSeparator, surely not with a html-comment
<!-- bingo -->. Why not? Try yourself.

here we use a css class.