Are emails sent via SMTP on x10 servers stored anywhere, or do they die in a puff of smoke? When I look at the sent folder in my webmail, there are none.
Automated emails are not normally stored, no -- and that's true in general, not just here. The SMTP server is just a traffic router, it's not an email application, and it's the email application that automatically saves a copy to your "sent" folder if you want it to.
I'm going to close this thread as your issue seems to be resolved - please feel free to reopen it or start a new thread if you need further assistance.