Question Change default SMTP Port in Plesk

[shanmuga]

Server operating system version

Ubuntu 20.04 aarch64

Plesk version and microupdate number

Plesk Obsidian 18.0.47.5

Hi,

I have noticed Plesk use default 25 port for sending mail. Unfortunately, my server provider blocks port 25 by default.

When i asked them they says to use 465, 587, or 2525 instead of 25.

How to change the default port?

 

[ChristophRo]

This is not possible as it's not the way "sending email" works

What you are looking for is a relayhost configuration - with or without authentication, that depends on the server/smarthost you are using.
i.e. something like this in /etc/postfix/main.cf

smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = static:USERNAME:PASSWORD
smtp_sasl_security_options = noanonymous
smtp_tls_security_level = encrypt

relayhost = [smtp.relayhost.tld]:587

 

[shanmuga]

What you are looking for is a relayhost configuration - with or without authentication, that depends on the server/smarthost you are using.
i.e. something like this in /etc/postfix/main.cf

I have to do this with SSH or SFTP?. No way to change in Plesk UI?

Is Port 25 is mandatory to send mails?

 

[shanmuga]

And which port Plesk use by default to send mail? 25 or something different?

 

[ChristophRo]

You need to make these changes manually via SSH
See also https://support.plesk.com/hc/en-us/...to-configure-relayhost-in-Plesk-with-Postfix- for some more information regarding this topic

As like every MTA, the postfix/qmail service on your Plesk server connects to TCP port 25 on the destination mailserver, to submit emails.

 

[shanmuga]

FROM YOU GUIDE. I HAVE NOT FOUND AN OPTION TO CHANGE POST OR RELAYHOST IN

MAIN.CF

 

[ChristophRo]

a) this file does not look like a "default" main.cf configuration file on a Plesk server....or it's already very heavily customized.
b) if you don't have a "relayhost =" line in that file, you can simply add it.

Best you run "postconf -f | grep relayhost" first, before you make any changes, to really see what is currently set on your server. ("postconf -f " does show ALL configuration settings, including all the default stuff that is not set in the main.cf)

 

[The 8th]

I have imunify360 installed on VPS, do i need to do anything to enable port 465 or 587, see the attached its not connecting in WHMCS