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There are many possibilities that the mail server does not properly receive emails, you may also refer to the SmarterMail Knowledge Base at http://portal.smartertools.com/KB/c2/smartermail.aspx.

In this case, the mail server does not receive emails due to misconfiguration on the SmarterMail itself and it can be fixed by following the steps below.

Step 1 – Log in to SmarterMail as admin using the URL “http://xx.xx.xx.xx:9998” or “http://webmail.yourdomain.com”

Step 2 – Click on “Settings”

Step 3 – Expand the ‘Bindings‘ menu and select on ‘IP Addresses‘. Select the IP address and click on ‘Edit‘.

Step 4 – Tick on ‘SMTP (25)’, ‘POP (110), ‘IMAP (143)’ and ‘Submission Port (587)’ then save it.

Step 5 – Verify that SmarterMail is listening to port 25 of your mail server by entering the below command on command prompt:-

telnet xx.xx.xx.xx 25

You will get a response like this:-

Trying xx.xx.xx.xx...
Connected to mail.yourdomain.com.
Escape character is '^]'.
220 mail.yourdomain.com

Step 6 – If you’re not getting any response as above, please make sure that the particular port has been enabled/allowed on your firewall.