Stephan Kuehn wrote:

The Mail address is definitly the problem. I´ve tested it in a test
environment.
Just try to send an E-Mail to the address and
you will see an error message - "format is incorrect".

When you said there is a dot before the "@", i didn't take that to mean
_immediately_ before the "@". That is, indeed, a violation of RFC 2822,
which states:

An addr-spec is a specific Internet identifier that contains a
locally interpreted string followed by the at-sign character ("@",
ASCII value 64) followed by an Internet domain. The locally
interpreted string is either a quoted-string or a dot-atom. If the
string can be represented as a dot-atom (that is, it contains no
characters other than atext characters or "." surrounded by atext

Notice that while dots are allowed in the local part, they must have "atext"
on each side of them, where "atext" is one or more letters, digits, or
specific special characters. See http://www.ietf.org/rfc/rfc2822.txt
--
Brian Tillman