How to send email if ISP blocks outgoing connections to port 25

[youyoums]

Environment: centos 7 server, installed the latest version of directadmin control panel, enabled Webmail: Roundcube;
Ports: The firewall has opened 25 (ISP has blocked the port, which is equivalent to not being able to use port 25), 587, 465, the three ports related to the mail business, and the port configuration of the exim.variables.conf configuration file is daemon__ports=25 : 587 : 465;
Problem: Can only receive emails, can't send emails.
Requirement: Under the premise that port 25 can not be used, how to modify the configuration file, i can send and receive emails through port 587, please give detailed solution ideas and technical solutions.

 

[BillyS]

This might be at least a good starting place for you

Sending Mail from Google Cloud

Sending mail should be easy, right? Besides a functional website, being able to communicate with visitors is essential. I don’t have systems admin skills, so I rely on panels such as CPanel…

webhostconnect.com

 

[Richard G]

how to modify the configuration file, i can send and receive emails through port 587, please give detailed solution ideas and technical solutions.

If port 25 is closed, you need to either use an external service ilke Google Cloud or setup your server as a smarthost to send your mail via an external mailserver service for example Mailchip or something else.

Sending outbound email through remote mail server | Directadmin Docs

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