If one outbound mail is 1MB, to 100 yahoo.com recipients. The total outbound networking bandwidth will be 1MB or 100MB? Why?

On Fri, 26 Mar 2010 07:36:47 +0000, Kelvin.W wrote:>>>If one outbound mail is 1MB, to 100 yahoo.com recipients. The total outbound networking bandwidth will be 1MB or 100MB? Why? The answer depends on how the e-mail is sent from the client.If it's an Outlook MAPI/RPC or RPC-Over-HTTPS, or OWA client and all100 recipients were placed into the "To:" header, then there should beone email and 100 RCPT TO commands.If the Outlook client used a local Distribution List with 100 membersthen there'd be 100 messages, each to one reciient (if I remember theway Outlook handles local DLs correctly).Assuming the best case? There'd be 1MB * 1.3 + some small overhead forthe SMTP commands. The 1.3 is the approximate expansion factor forencoding the 8-bit characters in a base64-encoded MIME message part.If there were a HTML body part in the same message you can double the1MB figure.---Rich MatheisenMCSE+I, Exchange MVP--- Rich Matheisen MCSE+I, Exchange MVP