Hello Brock,

for proper sending of mails, it is necessary to set the correct ip addresses for both
gateway and dns server.
You can also try Google's dns servers 8.8.4.4 or 8.8.8.8 and test again sending a mail.

Regarding your issue with the false positive virus detection, we tested it beside our local
virus scanners also on virustotal online scanner, that uses the most popular virus scanners
and did not find any suspicious marks in the used files.
What virus scanner do you use?