Regex: Mar. 29th UUG Meeting

Michael L Torrie torriem at
Wed Mar 21 12:00:59 MDT 2007

On Wed, 2007-03-21 at 11:49 -0600, Daniel wrote:
> wouldn't it be easier to check to see if the suffix matches an mx
> record or something?

There are such things as invalid characters in the first part of the
e-mail address.  So if you only check the domain, then you'll get a lot
of false-positives and subsequently a lot of bounces to your mail

Further it is possible to send mail to an address for which there is no
MX record.  For example, myaddress at works just fine,
even though there is no domain "" and hence no MX
record.  As long as the "" resolves to something, the
mail can still flow.


> -Daniel

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