[Exim] local_part_suffix

Is it possible to allow two different characters for local_part_suffix? I use this
feature to create on-the-fly unique email addresses, user+stuff@.... Many websites
have broken email validators that reject the +, so I want to also support a hypen. I
currently use this, "local_part_suffix = +*". What's the syntax for either - or + ?

Unrelated, what's an easy way to get exim to change my sender address when I
send to this list. I signed up using "rossz+exim@...." and I keep forgetting to select
the correct profile when I send to the list, so it doesn't go through (yeah, I'm stupid).

Rossz