[wp-trac] [WordPress Trac] #10420: wp_mail fails to send to multiple recipients

[WordPress Trac]

#10420: wp_mail fails to send to multiple recipients
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 Reporter:  patmcnally    |       Owner:                     
     Type:  defect (bug)  |      Status:  new                
 Priority:  normal        |   Milestone:  Unassigned         
Component:  Mail          |     Version:  2.8.1              
 Severity:  normal        |    Keywords:  wp_mail, smtp, mail
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 The function wp_mail as defined in wp-includes/pluggable.php does not
 correctly handle multiple recipients when they are passed in as a comma
 separated string to the first parameter($to). This is evident when using
 any SMTP server that strictly adheres to section 4.1.1.3 of rfc2821 (such
 as gmail).

 For example when the first parameter to wp_mail is "foo at example.com,
 bar at example.com" this string is passed directly to the SMTP server in the
 first and only RCPT command. Expected behavior is two separate RCPT
 commands, one for each email address.

 phpmailer supports the required functionality, however
 $phpmailer->AddAddress needs to be called multiple times for each email
 address contained in the first parameter ($to). Instead AddAddress is
 called only once, borking any attempts to send to multiple recipients when
 using gmail's SMTP server.

 I would submit a patch, however this is my first time investigating both
 php and Wordpress and fear that I could only do more harm than good.

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Ticket URL: <http://core.trac.wordpress.org/ticket/10420>
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