I am having an issue with Scan to Email functionality on the Sharp MX-M450N copier/scanner/fax. I can authenticate to the SMTP server when I run the test from the machine. However, whenever I try to email myself a scanned document, the machine comes back and can't send the message. THe machine supports both old-school smtp and the new type with secure smtp.
So here's what i've done to try and solve the issue:
1. Set up the same email account on a local laptop with outlook. I was able to send an attachment just fine using the email address, password, and smtp settings that failed on the machine.
2. telnet (public IP of SMTP server) 25 - this came back ok too
I did upgrade the firewall to an ASA 5505 within the past week. Could this be the source of the problem?