I installed a mail server using roundcube for appanel using digitalocean's ubuntu 20.4 vps but could not install it successfully, often getting the following errors: Installed the first time: received internal mail, mail from gmail or other services sent to but could not send Installed the second time: received internal mail but could not send and receive mail from gmail and other services? Everything was set up ok, when using send mail in the server, I got the error: "Some cloud vendors (such as Google, Amazon) close port 25 by default, and you need to contact the vendor to open port 25 before you can use the post office service normally" How to install it successfully, guys?

How to fix mail server??

aaP_mobadme

I installed a mail server using roundcube for appanel using digitalocean's ubuntu 20.4 vps but could not install it successfully, often getting the following errors:

Installed the first time: received internal mail, mail from gmail or other services sent to but could not send
Installed the second time: received internal mail but could not send and receive mail from gmail and other services?
Everything was set up ok, when using send mail in the server, I got the error:
"Some cloud vendors (such as Google, Amazon) close port 25 by default, and you need to contact the vendor to open port 25 before you can use the post office service normally"
How to install it successfully, guys?

aaP_demo1

aaP_mobadme
First of all, you need to make sure:
• VPS provider must be enabled port 25 by default. if they blocked, use port 465 or 587 for client to connect.
• Roundcube must be configured with port 465 or 587
• If the above solutions are not working, try using SMTP Relays for your mail server.

aaPanel_Kern

Hello, is it normal now? Is it restricted by the server provider?
Use the test command from the server to see if port 25 can be accessed
CentOS:
yum install telnet -y && telnet gmail-smtp-in.l.google.com 25
debian/ubuntu:
apt install telnet -y && telnet gmail-smtp-in.l.google.com 25

aaP_mobadme