[wp-trac] [WordPress Trac] #33698: SERVER_NAME may not be set in wp_mail()

[WordPress Trac]

#33698: SERVER_NAME may not be set in wp_mail()
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 Reporter:  szepe.viktor  |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Mail          |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
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 `$sitename = strtolower( $_SERVER['SERVER_NAME'] );` results in an empty
 string thus an invalid sender address: `wordpress@`

 Please fall back to `$_SERVER['HTTP_HOST']`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33698>
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