==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.0
- Deployed with iRedMail Easy or the downloadable installer?
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mysql
- Web server (Apache or Nginx):nginx
- Manage mail accounts with iRedAdmin-Pro?no
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

Webmail has been working flawlessly until today. Now, the server is unreachable depending on the IP address I try and connect from. My IP address does not work, however my vpn’s addresses will. I can toggle back and forth between address and clearly see the results.
My first thought was Fail2ban, so I:

 sudo fail2ban-client stop

With Fail2ban stopped, there is still the same issue. I cannot reach webmail from my IP address but I can from my vpn’s address. (Ironic that to use imap I have to use my address and can’t use vpn). What besides Fail2ban would be preventing a specific ip from connecting to webmail.