> Two comments:
> 
> 1: "deferred" is not the same as "blocked"

Fair enough. An email that was stuck yesterday finally made it out after 6h in 
the queue. Whether that's because I asked the Yahoo team again or because the 
deferred time had expired is unclear. I have seen emails from us to yahoo get 
deferred until postfix gave up after 3 days, which made me doubt that it was 
really just "deferred".

> 2: If the team is boosting your reputation but it deteriorates repeatedly ,
> there has to be a reason. ie: Are you sure you are only sending what you
> are sending? Are you sure people don't complain about it? Are you sure
> nobody else is sending from the same IP?

All of these have crossed my mind and I have looked hard to find evidence of 
abuse of the server, but haven't found any. The Yahoo feedback loop has not 
sent anything that indicates that someone is complaining about our email. I 
suspect that neighbouring spammy IPs which are not under our control and have 
nothing to do with us may have made Yahoo reject an entire IP range, but it's a 
total stab in the dark without further information.

Thanks,
Kasper


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