1 Topic by port25fix

  • port25fix
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  • Registered: 2016-03-03
  • Posts: 1

Topic: Port 25 Workaround

Centos 7 e-mail server able to send e-mail, but unable to receive e-mail. Static IP address is from a VPN service that does not block any ports, but Port 25 is blocked by ISP. Is there a workaround to make it possible to receive e-mail at server with ISP blocking Port 25? Do we absolutely need Port 25 open for e-mail server to fully work and receive e-mail?

==== Required information ====
- iRedMail version (check /etc/iredmail-release): v0.9.3
- Linux/BSD distribution name and version: Centos 7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL? I am not sure
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro?
- Related log if you're reporting an issue:
====

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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

2 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
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  • Registered: 2009-05-06
  • Posts: 30,805

Re: Port 25 Workaround

All other mail servers connect to your port 25, so it's required.