This may be strictly off-topic, but I'm hoping it will pass.
If you receive a letter that does not begin with an adjectival phrase followed by your name and end with herzlichst, hochachtungsvoll, beste gruesze, or some such phrase, (1) how if at all offended are you, and (2) how do you reply?
PS. Maybe this never happens in German speaking countries. But, if you were to get a /letter/ (in all but the said features of its form) which it would be impractical to ignore, what would you do? Would you reply in the same form or politely as you would normally?
The background for my asking is that I live in a Scandinavian country, where the traditional letter form is exactly the same as in German speaking countries. But that form is now being suppressed by letters beginning with a single line containing only the word 'hi'. This will happen when you deal with a store or your university &c. To me this is deeply offensive, and I imagine it would be to German speakers as well, but perhaps you never see it.
Take for example this e-mail from a printshop:
Hallo, Soll der Umschlag rot oder grün sein?
Suppose, if it makes a difference, that this is in reply to a correct letter.
PS II. I use 'letter' to refer to electric as well as paper letters.