Yahoo mail blocking my partners IPs.

jeffnascimento - Jan 24, 2023 at 08:51 AM

Hello,

Every time a specific partner, whos using King Host as email provider, sends me a message, he gets that error. I could not find anything on Yahoo configs to whitelist that IP or his domain. 

<***@***>: host mta5.am0.yahoodns.net[67.195.228.109] said:
    553 5.7.2 [TSS09] All messages from 191.6.228.30 will be permanently
    deferred; Retrying will NOT succeed. See
    https://postmaster.yahooinc.com/error-codes (in reply to MAIL FROM command)
 

Any clue on how to solve that?

Thanks
Windows / Chrome 109.0.0.0