Lusche, this is what your ISP's mail server is telling our mail server.
Jul 15 21:27:41 bbs sendmail[25452]: [ID 801593 mail.info] v6G2RcCW025450: to=<xxxxxx@xxxxx>, delay=00:00:03, xdelay=00:00:03, mailer=esmtp, pri=121484, relay=mx-ha02.web.de. [212.227.17.8], dsn=5.0.0, stat=Service unavailable
I removed your email address from the above log entry. I have a bunch of the above entries for July 15,16, and 17.