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Comment by lbriner | Hacker News Reader

Yahoo's latest tactic is just to insist on complete DMARC alignment to even stand a chance of being delivered. We have no problems with pretty much any other provider apart from them. And of course, they won't help you understand what is wrong with a particular message and how to avoid spam traps because "that would help phishing", which of course is patently nonsense since GMail pretty much tell you how to keep you mail acceptable.

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I have 100% compliance with DMARC, DKIM, SPF, reverse DNS records set, a valid SSL cert - and Yahoo still drops half my mail. Works at basically every other major provider: Gmail, AOL, iCloud, Outlook, Yandex, etc.

My conclusion is that Yahoo's spam filters just suck in general.

And yet, during my annual login to the Yahoo account I keep around out of morbid curiosity, it’s full of spam. It seems like refusing to accept inbound mail would be an improvement in their filtering.

Full disclosure: I work on Yahoo Mail, but I’m not speaking for my employer.

Have you checked out CFL? If users mark sender’s messages as spam, it can impact that sender’s deliverability. The CFL can help avoid these recipients by understanding spam reports.

More best practices for deliverability: https://senders.yahooinc.com/best-practices/

The domain in question is exclusively used for personal email by myself and close friends/family I trust. I would be surprised if a single message ever sent from this domain has been manually marked as spam on Yahoo.

Im guessing you run your own mail server more for fun? It’s the one service I use frequently but I’ve never tried to self host - its always seemed like a lot of pain.

AOL and Yahoo mail have very similar backends given they are owned by same company.

Same here, most of mine are just delayed though.

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...

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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