If you send something with a formal/legaö letter, you may provide a copy via mail or fax or so before. If so, you usually change that copy to include something like this:
per fax followed by letter
per mail followed by letter
per fax in advance
per mail in advance
If I style my letter with scrlttr2, where do I put that?
The receiver address field is bad to abuse and I only found the
specialmail KOMA variable. However, this includes it at the top right of the address field and underlines it.
I guess this is supposed to be used for something else.
So could you please also explain to me, what I should use
What I expect
As far as I have seen in most letters these words are printed after or – more often (and I would prefer that) – one or two lines before the receiver's address.
The text is usually written
-- surrounded by two or three hypens
So in the end, it may look like this:
-- per mail in advance --
c/o Some Company Org
Subject: Demonstration for StackExchange
Dear Mr. Joe,