We have a subtenant who uses AOL and tried to send a message to three of our internal users. He unfortunately got a bounce back. I had him send me the NDR and original message to an outside account as well as my internal account and surprisingly it was delivered to both. I had him send to each of original recipients individually and the message went through.
I started looking through my spam filter. I looked at all the Denial of Service and Blacklist rejections recently and compared them to the list of AOL sender IPs and found two hits in the past hour.
Both are AOL sender IPs and both blacklisted. I guess my question, is anyone aware that AOL uses specific outbound IPs when there are multiple recipients and a different IP set when it’s a single? Has anyone else run across blacklisted AOL outbound IPs?
AOL Outbound Sender IPs