I don't have problems with receiving mails, but after sending mails I get the
message:

"554 5.7.0 Reject, id=16822-12 - Message refused, this message appears to be
spam"

In the menu options/preference/junkmail, I unticked the box about
postmarking message, I entered the mail addresses on the Safe Senders List
and Safe Recipients List and altered the preferences in my AntiVirus Program.
I didn't help. What else can I do?