I am trying to understand how the SMTP server works and what it's limitations are. but so far Digi is beating me up again, I would appreciate it if someone could explain the following behavior to me.
using the "Email Services Sample" I have tried the following.
user account for GMail Pop, Yahoo, GMX.com and our own email.
The results I get are Gmail and Yahoo don't work at all. so I am guesing they use some form a login security that NetOs7.4 doesn't support.
GMX only sends message 6, using Digest MD5 authentication. so I think I get that GMX.com requires MD5 authentication, and the other messages doesn't set the authentication.
But what completely baffles me is when using our internal email, I only get, messages 3, 4, and 6. Looking through the code the only thing 3, 4 and 6 have in common that the others don't is that they attach 1 or more files. message 5 attaches a file too but it uses a different api then the others (MCAdd_FileAttachment instead of MCAdd_Attachment) Can anyone explain this to me?
Since the email settings will need to be set up by the end user I really need a good explanation on how to write solid code on sending an email, as I have no control over the End Users Email server.