>Do you know how I can write this string to the message header using MSMAPI?

Umm, I know this sounds lame but I've never sent mail using MSMAPI :)
My normal mail procedure is to connect to the database from a UNIX box and queue it up using sendmail.

BTW, how do you verify your email addresses? It can eat up unnecessary resources if you have a string of bad email addresses (real life example, I have a database with 35K email addresses, I queue them up 250 at a time, if 250 end up bad, then they stay in the queue for x amount of time, clogging the pipe)
My solution was to verify domains (usually about 10K, there are a lot of aol and earthlink and isp addresses out there) then sort by ping result from eash domain. It slows down the initial build-up of the list, but your server can spit them out much faster :)


Just my .02
-Stephen VanDyke