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If you thought coding gethostbyname by name was a hassle, your really not
going to like this.

First a ping is only going to validate the domain name, if Ping is not
block. Try to ping IBM.com, microsoft.com. It will not validate the email
address. You need to see if the domain has a MX record
http://archive.midrange.com/midrange-l/200110/msg01567.html
if non use the A record. Then you would have to use sockets to connect to
the mail server, following the protocol for SMTP
http://www.zvon.org/tmRFC/RFC2821/Output/chapter4.html

I have done this in Visual basic, but not on the AS/400.

John Ross



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