==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2
- Deployed with iRedMail Easy or the downloadable installer? Yes
- Linux/BSD distribution name and version: Canonical-Ubuntu-20.04-2020.10.14-0
- 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.
====

I can't always reach my mailserver through the web or through outlook when I am on Spectrum internet.  If I switch over to ATT, Verizon, or any other network it works fine.    Sometimes its works on Spectrum, but most of the time it doesn't.

Is there anything on the iRedMail server that may cause that?