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Question on SMTP multi-RCPT/ SMTP pipelining when using IIS SMTP virtual server

Last Modified: 2013-11-30

I have a Windows 2003 Server running an application that needs to send mail. Basically, the application is configured to send mail to the local IIS SMTP virtual server, which is configured to send the mail to the SMTP relay server.

Say for example the application needs to send one email, but to 10 recipients (within the same domain). This would still count as one email, right, since IIS SMTP virtual server supports SMTP multi-rcpt/SMTP pipelining (not sure of the exact name) where one message envelope is used to send email to multiple recipients in the same domain? Or would the ability to use SMTP pipelining depend on the application?

Also, if there were 9 recipients in one domain, and one in another, would that count as two mails if SMTP pipelining was used?

Any help appreciated, I need a quick answer, so max points ;)

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