Email not sending or receiving .

Site is working fine, only problem is email is not working, email not sending or receiving.

working on same domain, but when i try to send it out site it stop sending and show below message also not receiving outside of domain Failed to send mail : SMTP command failed : 421 4.3.2 All server ports are busy



Howdy -- it looks like you're using Virtualmin GPL there.

It's no problem to get support!

But you'd want to do so using the Forums. We monitor the Forums, along with lots of wonderful folks in the community. Thanks!