If the Windows server has a lower IP address, SM v15 will quite possibly default to this - I have seen this problem and commented on it elsewhere in the forum. You should use the lowest IP address on your server that's in that IP block for SM, which may mean re-addressing the server itself if the lowest address has been blocked.

 

You can also use a firewall/NAT router to change the public address, so that the server's LAN address stays the same, but in your case that will require re-addressing the server to a LAN address, with the public address(es) configured on the router. This is what I do.

 

FYI my router/firewall is a recent model Sonicwall.

Thanks for the direction. We've changed the lower IP number on the NIC. I've checked the SM DNS settings and all the configurations, and I'm now getting a slightly different error?

Failed Recipient: recipentname@gmail.com

Reason: Failed all attempts to connect to recipients mail server

   -- The header and top 20 lines of the message follows --

Received: from DanielWin10 (71-95-111-10.dhcp.knwc.wa.charter.com [71.95.111.10]) by mail.in8dna.net with SMTP;

Ideas?

Check your smartemail domain configuration files for the old IP.

Edit the file, update the old IP with the new and restart the service.

Have you updated smartermail's outbound IP?

What a relief. After 6 weeks of GMAIL challenges, we're running. I believe the final issue was the DNS settings. When SM DNA was set to use the NIC, or aimed at the internal Rackspace DNS IPs, it failed to deliver to GMAIL, when SM was set to 8.8.8.8 and 8.8.4.4 (Google) we get delivery.

Thanks for the assistance. Much appreciated.