T-Online blacklisted SES IP addresses

Question

Hello,

we have a problem with T-Online.  
It seems that T-online blocks out AWS SES servers.  
Following bounces appear everytime my app sends a mail to T-online mailboxes with SES:  
  
```
smtp; 554 IP=23.251.226.12 - A problem occurred. (Ask your postmaster for help or to contact tosa@rx.t-online.de to clarify.) Status: 5.3.0
```

There were similar threads in the forum:  
https://forums.aws.amazon.com/thread.jspa?messageID=695663&#695663;  
https://forums.aws.amazon.com/thread.jspa?messageID=703368&#703368;  
  
Could you please urgently help to resolve this?  
Thank you!  
Lutz

rePost-User-2742046 · Answer

Its happening again. We contacted tosa@rx.t-online.de  and also the form on https://postmaster.t-online.de/kontakt.php but they rejected our request as AWS needs to get in touch with them.

Stefan · Answer

Same here. Stopped working a few days ago...

Whats up @AWS?

peda · Answer

Unfortunately this keeps happening again and again with T-Online, but usually it only lasts a day or two - but this time ALL our emails to T-Online are getting reject for almost an entire week already and no solution in sight. This is affecting our business ...

@AWS any update on this issue?

T-Online blacklisted SES IP addresses

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