[wp-trac] [WordPress Trac] #5273: some registration emails fail in 2.3.1

[WordPress Trac]

#5273: some registration emails fail in 2.3.1
---------------------+------------------------------------------------------
 Reporter:  camner   |       Owner:  anonymous          
     Type:  defect   |      Status:  new                
 Priority:  normal   |   Milestone:  2.5                
Component:  General  |     Version:  2.3.1              
 Severity:  normal   |    Keywords:  registration emails
---------------------+------------------------------------------------------
 Registration emails sent to certain addresses where "callout verification"
 is enabled will fail.  The following delivery failure notice will be
 generated:

 A message that you sent could not be delivered to one or more of its
 recipients. This is a permanent error. The following address(es) failed:

   t231 at recipient_domain.com
     SMTP error from remote mail server after RCPT
 TO:<t231 at recipient_domain.com>:
     host recipient_domain.com  [xxx.22.96.xxx]: 550-Verification failed
 for <wordpress at blogdomain.com>
     550-Previous (cached) callout verification failure
     550 Sender verify failed

 This was not an issue with WP 2.2, but occurs on an upgrade to 2.3.1, or a
 fresh 2.3.1 install with no plugins enabled and the default theme.

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Ticket URL: <http://trac.wordpress.org/ticket/5273>
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