What do you do when your email server has been blacklisted and you are unable to send emails to certain domains? It’s best to be proactive and not get on the blacklists in the first place, but in the unfortunate event you do get blacklisted, here are some notes.
Checking Blacklists
First thing is we need to see which lists we are on. There are a couple of services that check multiple blacklists
https://mxtoolbox.com/blacklists.aspx
These should give you an idea of which ones we need to go request a delisting.
att.net (yahoo.com, bellsouth.net)
AT&T is tricky as they don’t have an online site to show if you are blacklisted or not. They don’t seem very responsive and it can take awhile.
https://www.att.com/esupport/postmaster/
Send an email to “abuse_rbl@abuse-att.net” with your Mail Server IP address, the domain and ask to be delisted. You should get an auto-reply and then they usually will do something about it in 24-48 hours
More information below
https://pinpointe.com/blog/how-to-check-att-blacklist-request-ip-removal/
Other Blacklist
These are all fairly straight forward to check out. Some of them you will need to enter in an email, or maybe set up an account, others are as simple as requesting the IP to be delisted.