Hello! I'm new to this list at the recommendation of a fellow provider I was discussing this issue with. Hopefully moving forward I'll be able to help others but for now - I need some help/advice. I'll try to explain this briefly but ... I'm not good at being brief so I apologize for that.
We've been sending email since 2007 and have largely not had issues as we've always had anti-spam steps in place for outbound email. We've also always been on every FBL/JMRS we can find. On November 11th, 2024 we started having our customers reaching out to us letting us know that email to Yahoo and AOL users was being denied. The error message given across all of them is the same: Delay reason: SMTP error from remote mail server after pipelined MAIL FROM:<redacted> SIZE=5548: 421 4.7.0 [TSS04] Messages from 162.244.253.254 temporarily deferred due to unexpected volume or user complaints - 4.16.55.1; see https://postmaster.yahooinc.com/error-codes All of our email leaves via 162.244.253.253 and 162.244.253.253 [our outbound aniti-spam scanner IPs]. Our volume hasn't changed and we've received no complaints/FBL reports from any other providers. We've also manually reviewed our outgoing mail logs and cannot find anything that would cause Yahoo/AOL to make this change against us. My first thought was to check the AOL FBL as some were also reporting issues emailing AOL - only to find the AOL FBL is no more [big sad]. So the next step was to reach out to the Yahoo postmaster and we were directed to https://senders.yahooinc.com/contact/#sender-support-request We've filled out the request and all we keep getting back is essentially "follow our sender guidelines and don't send spam," as well as "allow up to 2 weeks," meanwhile we're handing the email for 38,000 domains [we're small, we know] and getting flooded with customers reporting an inability to reach AOL or Yahoo email addresses. I would totally get it if something big on our end changed, or if we were passing a large volume of spam, etc - but nothing has changed on our end. We tried spreading our email load out across more IPs [about 50 total instead of 2] and the deferment looks to be in place by default. It feels like Yahoo 'lost' their mail flow numbers or something and reset us back to 0 whereby suddenly the email from our 38k users looks like a huge change in volume [it's not, our volume hasn't changed]. Realistically it feels like we just need to talk to someone that's familiar with working with ISPs/ESPs instead of end-users - but I'm not sure. Maybe we're just not reaching out in the right way - or there's a better contact or form to fill out? I've reached out via the form, via email, twitter - and I've had zero luck getting anyone at Yahoo to acknowledge this or to assist in any way. "Give it two weeks," isn't really something I can just pass on to our end users. Any help or advice is very much appreciated. Thank you, Michael Denney MDDHosting LLC http://www.mddhosting.com/
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