Unable to receive/send e-mails: port 25 is blocked

Created:

2016-11-16 13:04:26 UTC

Modified:

2017-08-08 13:09:09 UTC

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Unable to receive/send e-mails: port 25 is blocked

Applicable to:

  • Plesk for Linux

Symptoms

Unable to receive/send e-mails.

It is not possible to connect to the server by telnet on port 25:

# telnet <server_ip> 25
Trying 192.0.2.2...
telnet: connect to address 192.0.2.2: Connection refused

Cause

SMTP Port 25 is blocked by firewall.

Resolution

If the firewall is configured in Plesk, open 25 port on the server in Tools & Settings-> Firewall

If the firewall is not configured on the server, contact your hosting provider.

See also #213932745 Which ports need to be opened for all Plesk services to work with a firewall?

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