All of the forms on any hosted site on one of our servers now produces an error "FrontPage Error. User: please report details to this site's webmaster. Webmaster: please see the server's application event log for more details."
Unfortunately, there's nothing in the application event log that corresponds with these errors. They seem to be email related because if I remove the email option then they display the confirmation page and save the data to the database file properly.
How can I find out where/why sending the e-mail is making it fail? I can't think of any changes on our mail server that would keep it from connecting and sending. And I don't think it's DNS related because on the server config page for we have it set to the IP address of the mail server in the SMTP settings.