If you login into their systems via IMAP or webmail from a non-german IP, and if you send the emails, the outgoing SMTP servers should be:
Quote:
mout-xforward.gmx.net. 3447 IN A 82.165.159.13
mout-xforward.gmx.net. 3447 IN A 82.165.159.12
mout-xforward.gmx.net. 3447 IN A 82.165.159.41
mout-xforward.gmx.net. 3447 IN A 82.165.159.42
mout-xforward.gmx.net. 3447 IN A 82.165.159.14
mout-xforward.gmx.net. 3447 IN A 82.165.159.40
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They are bad IPs listed by multi-RBL such as Spamhaus Zen. Then most peer systems (such as t-online) will reject those emails.
If you login into their systems from a german IP, then if you send messages, the outgoing SMTP servers become:
Quote:
mout.web.de. 78 IN A 212.227.15.5
mout.web.de. 78 IN A 212.227.15.4
mout.web.de. 78 IN A 212.227.15.6
mout.web.de. 78 IN A 212.227.15.14
mout.web.de. 78 IN A 212.227.17.12
mout.web.de. 78 IN A 212.227.15.3
mout.web.de. 78 IN A 217.72.192.78
mout.web.de. 78 IN A 212.227.17.11
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They are clean IPs which have good delivery capability.
I have tested for web.de/gmx.net/gmx.fr domains, all behave as this.
I feel uncomfortable with this.
