SMTP blocking

Unfortunately, sending spam is a practice that continues to be done quite frequently. To avoid this, the SMTP is blocked in accounts in the testing phase, so you will not be able to send e-mails. Anyway, if you have a specific need, e-mail us at sales@clouding.io and let us know. If you become a Clouding client, the SMPT will work as usual and you will be able to send all the e-mails that you want 🙂

Check SMTP traffic on Linux

To check if our server has SMTP traffic enabled we can run from SSH:

# telnet smtp.gmail.com 587

Trying 74.125.193.108...
Connected to smtp.gmail.com.
Escape character is '^]'.
220 smtp.gmail.com ESMTP b7sm16176209wmj.29 - gsmtp

If our server had SMTP traffic blocked or a firewall that blocked it blocking the result would be:

Trying 173.194.76.108...
Trying 2a00:1450:400c:c00::6d...
telnet: Unable to connect to remote host: Network is unreachable

Check SMTP traffic in Windows

To check if our Windows server has SMTP traffic enabled we we will connect by remote desktop and we'll run on command line:

telnet smtp.gmail.com 587

If connected correctly we will see a black screen like this:

If our server had SMTP traffic blocked or a firewall that blocked it blocking the result would be:

Connecting To smtp.gmail.com...Could not open connection to the host, on port 587: Connect failed operable program or batch file.

It's because we don't have the telnet client installed. We will open the administrator from the server and in adding roles and features we'll choose "telnet client" in the characteristics section.