This control allows you to validate an email address. It has three modes: Format, Server
and Recipient.
Format performs regular-expression checking on the email address to ensure it is a properly-formatted
string that ‘looks like’ an email address. For example, it ensures that there is only one
‘@. symbol, and that there is a username part and a domain part.
Server takes this further, performing the same regular-expression validation above but then performing
a DNS lookup for the server’s MX record to ensure that the domain exists and is mailable.
Recipient is the most comprehensive check, performing both Format and Server checks and then trying
to validate that the address can be mailed.
Email address:
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Note: some servers deliberately do not divulge recipient
information to senders, to prevent spammers from targetting a server and gaining a list of valid
addresses. This is only a worthwhile validation check in certain circumstances!
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