Are Mail Server Ports Reachable?
SMTP(outbound) 25(smtp) 465(smtps) 587(submission)
POP3(inbound) 110(pop3) 995(pop3s)
IMAP(inbound) 143(imap) 993(imaps)
Control Ports 11111(closed) 80(http,open)
What's this all about?
This site is a portscanner, which is scanning the standard mail server ports in order to determine if there's some kind of firewall between your computer and public mailservers in the internet, which blocks the use of mail services.
What exactly does it do?
Hints for various web browsers
- Internet Explorer 8,11,Edge: Working fine without any configuration
- Firefox: Working fine - Configuration required
- Google Chrome: Working fine - Configuration required
- Open "about:config" in your browser address bar
- Click right in the main page
- Select new > String
- New Property Name: network.security.ports.banned.override
- New Property Value: 25,110,143,465,587,993,995
Firefox is blocking the required ports by default. If these ports are not configured as allowed, this page wrongly indicates all ports are open. You can allow the ports doing this:
Google Chrome also block the required ports. This site also wrongly indicates all ports are open if the blocking is not removed. You can tell chrome to allow connections to the ports by executing chrome with these command line parameter: chrome.exe --explicitly-allowed-ports=25,110,143,993,995,465,587