I want to write a Windows application to go through all the email addresses
in an SQL Server table and to report which ones are invalid. From Googling
and perusing NGs it is my understanding that the process to validate an
email address is done at 3 levels:
1. Verify that it is syntactically valid
2. Verify that the domain exists (SMTP verification)
3. Verify that the email address exists at that domain (MX verification)
The first one I can do with a regular expression or some Instr functions. I
am looking for some information (ideally code samples/classes) on how to
accomplish the other two levels of verification. Any pointers are
appreciated.
Wayne