Question Firewall rules SMTP Server

[sy911]

Server operating system version

Ubuntu 22.04 x64

Plesk version and microupdate number

Version 18.0.54

Hello,

I have set the firewall rules in Plesk to "Allow from selected sources, deny from others" for both the SMTP (submission port) server and the SMTP (mail sending) server, aiming to enhance the security of port 25. Could you please confirm if this setting will not cause any other issues?

I look forward to your response.

Thank you.

 

[Peter Debik]

Blocking port 25 is not a good idea, because that must be available to all other servers on the Internet. Else they won't be able to send mail to your server.

 

[max2334]

Hi,
I have a question, too. I set for SMTP (mail sending) server, Allow from selected sources, deny from others, and I set my IP address of the server, but now I can send mails, but not receive mails.
Can anyone help me with this?

 

[Kaspar]

Hi,
I have a question, too. I set for SMTP (mail sending) server, Allow from selected sources, deny from others, and I set my IP address of the server, but now I can send mails, but not receive mails.
Can anyone help me with this?

Did you see @Peter Debik post above yours?

 

[max2334]

Ah, now I understand. I have an issue my IP address is using in a botnet, so I need to secure the mail server.. what should I do?

 

[Kaspar]

Ah, now I understand. I have an issue my IP address is using in a botnet, so I need to secure the mail server.. what should I do?

That's different question. Open a new topic with a the details.