[Typo3-dev] Improvement of function validEmail($email)

[Martin T. Kutschker]

Stefan Geith wrote:
> Hi,
> 
> I had the idea to check for an existing MX-Record in DNS,
> when validating an email-address. So only email-addresses
> with a valid domainname would be ok.  Good idea ?

On php.net it says checkdnsrr() ist not available on Windows.

And for getmxrr() it says you shouldn't use this function to verify an 
address, because if no MX record exists then you should use the domain 
itself.

But even if you change the code I'm not sure if this is a good idea. 
Checking against DNS is fine, but I have a bad feeling for adding this 
in this function. The calling code might not expect delays introduced by 
your changes.

Perhaps an additional argument or another function may be approriate.

Masi

PS: I had submitted an IMHO improved version of the regexp, which seems 
to be lost on the now defunct Mantis bugtracker on the netfielders.de 
server.