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553 bad sender list criteria

Hi there,

host[] said: 553 sorry, your envelope sender is in my badmail list. (#5.7.1) (in reply to RCPT TO command)

Usually in 553 message as the one I quoted above, there is an url provided to among other things have the listing removed.

I am the mail server admin for the host being rejected, the mail server I run is located in Frankfurt, Germany and has been an MTA since 2016.

It has never been listed as sending out spam or associated with any kind of malware.

What is the criteria for the listing?

What is the process to whitelist blacklisted servers (who should have at most been greylisted)?

Thanks in Advance and greetings from Vienna, Austria,


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