Can’t not send email to gmail or other domain

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1

I am deeply sorry, but I was not able to deliver your mail to the following addresses:
ABC@gmail.com : Unable to connect to 142.251.175.27: Connection timed out
There will be 17 more delivery retries
Next retry scheduled Wed, 15 Jan 2025 12:49:09 +0000

Please help me fix issue it

2

Check if your ISP blocks port 25. Many ISPs do to prevent spamming. From the axigen server, try to connect to that address with the nc command. you should see a response, after which you can press ctrl-c to exit.

➤ nc -v 142.251.175.27 25
Connection to 142.251.175.27 port 25 [tcp/smtp] succeeded!
220 mx.google.com ESMTP 41be03b00d2f7-c1e7d7a4dcesi49312122a12.433 - gsmtp

if you just see it sit there with no “succeeded” message, then your ISP is blocking port 25. my ISP does this, so i set up an account with Amazon SES for outbound delivery. this is better anyway, since many RBLs have public/residential IP blocks along with addresses for low-budget hosting servers. SES includes reputation control, so you’ll have a much easier time getting your mail into the inbox instead of the end user’s spam folder.