Didn't quite know where else to ask this on this forum, so if it's inappropriate for this subforum, I apologize. So, my IP was blacklisted in by Spamhaus PBL recently because of something my server's ISP did (server is a VPS), and I've had to contact my vendor to contact said ISP, but now they've opened up a request for removal directly with Spamhaus to open a ticket on my behalf and Spamhaus was supposed to send an email with the verification link. Problem Is, my server has been unable to send or receive mail since the blacklist. Sending from a Yahoo account just reports "554: 5.7.1 Service unavailable" even though I can receive messages from Gmail. All of my services are running with no error in my logs apart from the bounce-backs due to my blacklisting. What else should I check as to why I'm unable to receive my mail from other sources?