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X email didn't go through

• Find the email in the eximlog. /var/log/exim4/mainlog (on our mailservers, theres a symlink /el/mainlog).

• If exim log says C="250, their mail server accepted it. In that case:

  • If it was from civicrm, check if it bounced (they get processed every 5 minutes): grep -ri RECIPIENT_ADDR /var/www/drupal-and-civi/sites/default/files/civicrm/custom/CiviMail.*
  • Have the recipient check the spam folder.
  • Get it sent again with you cced you so you can inspect the headers.