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guilamu

I'm managing an email serveur sending around 1 million emails a month.

Since a while now, yahoo are delaying emails for 12 h to 48 h. I have 0 issue anywhere else than yahoo.

Not a single email sent by this server has been flagged has spam according to their own support staff.

I have no idea what to do to fix those delays and it seems they have no idea either...

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Sounds like greylisting:

https://en.wikipedia.org/wiki/Greylisting_(email)

Thanks for your reply. I had no idea this was a thing. I still don't have any idea why would yahoo would put us on a grey listing while Gmail and Hotmail don't.

I'm trying to get their support to help me. I'll update here if I have any useful answer from them.

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