1 (edited by zaphod444 2022-05-19 23:18:19)

Topic: Port 25 blocked (I read both guides)

- iRedMail version (check /etc/iredmail-release): 1.5.2
- Deployed with iRedMail Easy or the downloadable installer? Download
- Linux/BSD distribution name and version: Ubuntu 20.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): PGSQL
- 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'm trying to enable non-secure port 25 for an MTA to connect.

NOTE: This will connect from the outside world (so it will be public)

Also note: I could change the port if needed to 2525, it just must still be non-secure. I noticed the other guide about 2525 but it said it's dangerous to expose it to the outside world so I didn't follow that guide.

I edited `/etc/postfix/master.cf` to be:

#smtp      inet  n       -       y       -       1       postscreen
#smtpd     pass  -       -       y       -       -       smtpd
smtp       inet  n       -       -       -       -       smtpd

And I changed in `/etc/postfix/main.cf`

smtpd_tls_security_level = none
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_tls_auth_only = no

After I reboot the server, when I try to connect it still times out

nc -zv xxx.xxx.xxx.xxx 25

The actual error from the MTA is:

Error: connection closed by the remote host while connected from ...


Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team.


Re: Port 25 blocked (I read both guides)

Default iRedMail configuration accepts insecure inbound smtp traffic, so nothing should be changed ideally.
What error did you get on that MTA server?


Re: Port 25 blocked (I read both guides)

I solved it, thank you. My ISP (for my home internet) was blocking port 25 so I couldnt actually connect unless I tried from a different server