Official note I got from 1and1 Abuse Technican a few months ago:

Be aware that all mails that we forward on customer request and that are 
recognized as spam will be relayed via a host with rDNS mout-xforward.<domain>.

Your sample IP is such a relay, so you may feel free to block emails from those 
relays at all, respect the result of blacklists (which often will list those 
IPs, I guess) or ignore the result of blacklists for those hostname in general.

Mit freundlichen Grüßen / Kind Regards
Olaf Petry

Von: mailop [] Im Auftrag von Scott Undercofler
Gesendet: Mittwoch, 14. Februar 2018 15:16
An: Stefan Haunß <>
Betreff: Re: [mailop] Postmaster contact for 1&1

That’s what I get sending from their outbound. It’s not consistent so I assume 
not all of their space is listed.

On Feb 14, 2018, at 4:00 AM, Stefan Haunß 
<<>> wrote:

On 02/14/2018 10:51 AM, Suresh Ramasubramanian wrote:

His users might want to receive mail from 1&1 users, and 1&1 outbounds being on 
spamhaus stops this from happening?
"might want"...I don't know him so I want more details...

In cases like this, it is up to 1&1 to work out the block, rather than 
expecting operators to put in place a whitelist.

of course<>
 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...


On 14/02/18, 3:17 PM, "mailop on behalf of Stefan Haunß" 
<<> on behalf of<>> wrote:


   if you could describe your problem a bit more detailed you might get
   helped. why do you care of outbound IPs listed on spamhaus? are you a
   1and1 customer?


   On 02/14/2018 06:13 AM, - - wrote:
Y'all have your outbound listed on spamhaus and I'm taking a lot of heat
for deliverability issues from your space. Please contact me or request
spamhaus removal for your outbounds. Your courteous support staff hung
up on me when I tried to explain that the AUP code I had would not make
sense to your deliverabilty team.

Thanks in advance.

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