Email sending stages, Plz help me!

[Visual Basic.Net]

Please Help me to find answers for these issues:

1) Characteristics of email and the stages they go through in sending and the impact of an email server, mass emailing, why we have problems sending more than 10 mails to hotmail from the same address.

2)Shopping cart; what does it do and how it works, why it is necessary.

[Al42]

1) Some email servers are set up to consider more than X number of emails (incoming, outgoing or both) to be spam, and they block spam.

2) If you've ever bought anything on the internet, you've used a shopping cart. You select your purchases, enter a shipping address (and, maybe a billing address) and pay with a credit card. If you search you can find code (php, java script, etc.) for shopping carts. Microsoft has a few.

[Visual Basic.Net]

thx alot ... but you didn't explain all points ... I hope anybody can answer me ... by explains all points above ... specially, email sending stages!

[BramVandenbon]

search for SMTP, that's the main protocol for sending e-mail. You might also want to look up MIME and S-MIME. MIME is a layer on top of SMTP and S-MIME is a secured version of it, which supports X.509 certificates for example.


I got the following sample of a SMTP communication session from wikipedia. C represents the client (the sender), and S represents the Server (which will deliver the e-mail to the receipent).

S: 220 www.example.com ESMTP Postfix
C: HELO mydomain.com
S: 250 Hello mydomain.com
C: MAIL FROM:<[email protected]>
S: 250 Ok
C: RCPT TO:<[email protected]>
S: 250 Ok
C: DATA
S: 354 End data with <CR><LF>.<CR><LF>
C: Subject: test message
C: From: [email protected]
C: To: [email protected]
C:
C: Hello,
C: This is a test.
C: Goodbye.
C: .
S: 250 Ok: queued as 12345
C: QUIT
S: 221 Bye

I think that forms a good answer to your question, right?
Enjoy!