SMTP E-mail Notification Error

  • Hello,

    I am unable to use the SMTP E-mail notification as I am receiving an error in system logs. Could not send the message to – could not connect to the host "": ??

    Currently I have a mail server on my DMZ network were I can receive and send mail with no issues using port 25. The setup looks to be straight forward but I may be missing something.

    Any help would be much appreciated.

    Thanks in advanced.

  • I guess that resolves to the public IP of your pfSense, which is forwarded in to the DMZ.
    That loop is likely the issue.
    You could do "split DNS" - in DNS Forwarder add a domain override for (and maybe also that resolves directly to the private IP in the DMZ. Then pfSense will send its mail direct to the server in the DMZ.

  • Is '' the genuine name of your mail server? You could always try entering the IP address of your mail system instead of relying on DNS (System/Advanced/Notifications tab). The notification email address (recipient) could just remain as '' - or whatever the actual address really is. You also might want to check to be sure that your mail server is set to allow inbound messages from your firewall from a trusted domain - otherwise, the mail server might reject the message as spoofed.

  • I tried using the DNS forwarder and using the public address for but unfortunately this did not resolve the error but when adding the private address ( in the E-Mail server textbox for notification all worked fine.