We are an ESP that sends thousands of emails from various clients. Over the past month, all of our clients are seeing delays/non-delivery to the VirginMedia domains. None of the IPs or domains are on any blacklists. Can someone reach out to me and let me know what we can do to improve delivery?
We are seeing the below bounce code, which is strange since mail is coming from a power company regarding recent usage, so complaints/spam is at a minimum. We see this code whether 1,000 daily emails are sent or 20:
"421 4.2.0 MXIN605 Too many spam emails from your IP in the last hour. Fix and retry later ;id=JduejUlRME6q0Jduejkt1v;sid=JduejUlRME6q0;mta=mx3.tb;d=20200401;t=160012[CET];ipsrc=22.214.171.124;" while connected from mta4.eu-west-2.e.alterian.net (172.29.21.148) to mx.tb.ukmail.iss.as9143.net (126.96.36.199)
@ScotBergg I'm happy to take a look at this for you. I'm quite familiar with rate limit problems having looked at a similar problem recently. Would you mind sending me the full text & headers of the rejections you're getting please, via PM? You can PM me by hovering over my username and clicking the Send Message button. I can also provide an email address if it's easier to send attachments, just PM me either way.