I have an Altalink C8145 that I have setup SMTP using the same settings as a C8045. The test email function from web broswer passes but when I try to send an email from UI if fails. I have rebooted the copier. Powered off for 2 minutes and powered on. I have verified that the DNS/Domain name and TCP/IP settings are correct as well as the date/time. The hard drive was just replaced and the firmware is 113.010.001.06011. I tried cloning the C8045 email only settings into the C8145 but the clone fails.
Have you tried enabling the scan confirmation report to obtain an error message, click here for those instructions.
If you are still having issues after trying these steps, I suggest that you call into our support department for assistance @ 1-800-821-2797.