To validate the domain name, just do a DNS MX request on the hostname (the part after the @). If you get a valid response, the hostname is valid.  That's going to be much more "future proof" than anything using a fix list of GTLDs.

On Tue, Jul 7, 2015 at 6:07 PM Tony Primerano <[address removed]> wrote:

Depending on volume of requests, your best bet may be to try to connect to the user's mail server. 

There also appears to be a gem that queries the remote mail server now that might be worth a try.
https://github.com/kamilc/email_verifier  -- you may be able to do something simpler with Net::SMTP

When possible I'd rely on the underlying linux libraries to let me know an email address is bad. 

Tony

On 07/07/[masked]:01 PM, Camille Bell wrote:

I'm looking for a email validater needs to support international email addresses on an optional Rails email field.

The gems validates_email_format_of and email_validator both seem to have some issues.

Does anyone have good experience with one of these or can recommend another gem?

thanks,

Camille

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