What is the minimum requirement for a smtp email program?

[pcwc66]

Hi,

I'm trying to write a routine to send smtp email. I wonder what is the minimum requirement for such a routine so that it can send email to majority of smtp server (in other words, most smtp server will accept the email sent by my routine). RFC 2821 specifies the minimum implementation of the receiver side. I cannot find any RFC which specifies the minimum implementation of the sender side. I want to know what authentication is the minimum requirement for such routine. Should I use something called SMTP AUTH or ESMTP AUTH? Where can I find examples and/or explanations of SMTP AUTH and ESMTP AUTH?

Thank you for any help.

 

[FarOut]

To establish a connection to a mail server is quite simple. When testing our system we use a Telnet connection to port 25 of our SMTP server. Then issue the minimum commands to receive an e-mail to a test account. Here is a link that will outline and explain these commands. These I beleive to be the least amount of commands you could use to complete a full transaction with an e-mail server. Hope it helps, and that I understood your question correctly.

http://www.yuki-onna.co.uk/email/smtp.html

FarOut
V-Peace-V

 

[pcwc66]

Hi FarOut,

Is it true that most smtp servers require some kind of authentication due to spams? If yes, what kind of authentication is commonly used? I have read something named smtp auth, esmtp, esmtp auth, s/mime. Are they all different ways of authentication?

Thank you.