[wp-trac] [WordPress Trac] #17433: localhost is not accepted as email domain

[WordPress Trac]

#17433: localhost is not accepted as email domain
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 Reporter:  sanvila       |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Formatting    |     Version:  3.2
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |
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Comment (by kurtpayne):

 @westi I was ready to disagree and defend "user at localhost" as a valid
 address, but I dug into this a bit more and found this post on
 [http://stackoverflow.com/questions/3406473/why-does-filter-varemail-
 filter-validate-email-allow-testtest stackoverflow.com] which changed my
 mind.  The php developers who wrote the e-mail filter don't allow short
 domains because only FQDNs are allowed in SMTP servers according to RFC
 5321.

 Submitting patch 17433-2.diff to switch to email code to filter_var() as
 you and @toscho suggested.

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Ticket URL: <http://core.trac.wordpress.org/ticket/17433#comment:7>
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