ID #1117

My Mail Relay suddenly stop working

If you have not changed any settings and your mail relay account stop working. First, you need to make sure your mail relay is at good status by login to your account. After you login, click on Manage under Mail Relay next to the mail relay account name to enter Mail Relay Control Panel. At the control panel, there is a link Verify Your Mail Relay Account to verify that your mail relay is active and working.


If the account is working but your mail relay stop working without changing settings, it is highly possible that you the SMTP port you use to send out emails are blocked by either your ISP or firewall. You can use the DOS telnet command to test out if the port is blocked or not. Most likely, you are using port 25 which is the standard SMTP port to send out emails. Try command

>> telnet 25

and if the port is not blocked, you should see 

Connected to

Escape character is '^]'.

220 ESMTP Sendmail 8.14.4/8.14.4; Mon, 22 Oct 2018 00:29:18 -0400


If not, then the port is blocked. You can try other ports with command

>> telnet 25

>> telnet 26

>> telnet 940

>> telnet 8001

>> telnet 2525

to find a working port and switch to the new port to send emails. Port 80 is usually for web serving and it should never got blocked, you can always use port 80 to send emails.


If you are using MicroSoft exchange server for our mail relay service as smarthost, you can follow this document to change the smarthost sending port:


Change Exchange Server Smart Host Port Number

Tags: -

Related entries:

You cannot comment on this entry