validation - Email SMTP validator -


i need send hundreds of newsletters, check first if email exists on server. it's called smtp validation, @ least think so, based on research on internet.

there's several libraries can that, , page open-source code in asp classic (http://www.coveryourasp.com/validateemail.asp#result3), have hard time reading asp classic, , seems uses third-party library...

is there code smtp validation in c#, and/or general explanation of how works?

be aware mtas (mail transfer agent) have vrfy command turned off spam protection reasons, they'll block if try several rcpt in row (see http://www.spamresource.com/2007/01/whatever-happened-to-vrfy.html). if find library verification, won't worth lot. ishmaeel right, way find out, sending email , see if bounces or not.

@hrvoje: yes, i'm suggesting monitor rejected emails. but: not bounced mails should automatically end on "does not exist"-list, have differentiate between temporary (e.g. mailbox full) , permanent errors.


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