OK. Log says:
Mail::Sendmail v. 0.79 - Wed Feb  1 10:51:31 2012
Date: Wed, 1 Feb 2012 10:51:31 +0100
Server: *****.de Port: 25
From: me@here.com
Subject:
To: test-123@******.de

Result: 250 2.0.0 Ok: queued as 1066F1C8A7E0