Net os7.4 and the SMTP email sample

Embedded Devices NET+OS
1

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.

2

Yes, the Digi SMTP does NOT support TLS (SSL) so GMail, Yahoo, and the like don’t work. (It should, OpenSSL is part of NetOS, but someone got lazy.)

As for attachments, I haven’t used those with the MC API.

-Erik

3

Thanks that’s what I thought about gmail and yahoo. and about the attached files that’s the funny thing, I really don’t need to send files just a text email. (my luck if I wanted to send them that would be the part that wouldn’t work, but since i don’t want to it does and plain emails don’t)

I have confirmed that it is the MCAdd_Attachment api that causes an email to be sent. if I remove that one call the message no longer gets sent. Any ideas?

4

Hi,

Not sure if this will help you, but I have attached the deatails of the main routines that I use to send e-mails. This has worked for me with or without attached files