On 14 Feb 2018, at 6:00 (-0500), Stefan Haunß wrote:

of course http://postmaster.1and1.com is public and if you read the
following section carefully "IP Addresses for 1&1 Mail Servers" one
might come to the conclusion that there is no problem...

Which would be incorrect, because the listed addresses do not include all of 1&1's outbound mail servers. Notably, GMX outbounds are nowhere to be found there.

Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Currently Seeking Steady Work: https://linkedin.com/in/billcole

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