We recently redid our Citrix server and in order to make it work reliably both inside and outside of the network, had to alter our DNS settings. Previously, our DNS server had zones for domain and domain.local, but now also needed forward lookup zones for domain.com as well. I went in and created new cnames for everything (employee portal, exchange, etc) and everything was golden.
Right up until we found that our webserver could no longer send emails out. Our webserver uses PHP Mailer to send form results to people in the company and to remind people to submit timesheets. Since doing this change, it either gets an Error 500 or that the email address has failed a DNS check.
We are using 100% Windows setup and Joomla CMS for the website. The Joomla guys all agree that it's the DNS that's screwed up, but I can't seem to find a way to fix it. Any ideas?