Found this:

https://github.com/fetzerch/kasserver

​Anyone from  All-Inkl.com [1] here ?

​Thanks!
Scott​

On Thursday, 16/01/2025 at 04:49 Peter N. M. Hansteen wrote:



On Thu, Jan 16, 2025 at 04:32:27AM -0500, Scott Q. via mailop wrote:
> Thanks, so despite the bounce saying it's a problem with the
> recipient, it may very well be a problem with our sending IP ?
> 
> Just trying to make sense of what the error really means.

I keep thinking that we may need to factor in the possibility that
the developer who wrote the message may not have English as their
first language.

That said, yes, it is possible that the receiving end has implemented
per user (or per alias) rate limiting for *receiving* messages. Which
would be, let's say not the first thing I would have thought to do
myself,
but may conceivably be the case.

The reason I focused on the source address and NATing as a possible
explanation
was that they managed to get their messages delivered from a different
location.

It would be interesting to hear from whoever is in charge of the
receiving
end here about what it is that they have implemented.

-- 
Peter N. M. Hansteen, member of the first RFC 1149 implementation team
https://bsdly.blogspot.com/ https://www.bsdly.net/
https://www.nuug.no/
"Remember to set the evil bit on all malicious network traffic"
delilah spamd[29949]: 85.152.224.147: disconnected after 42673
seconds.



Links:
------
[1] https://all-inkl.com/
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