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Simple Mail Transfer Protocol. Configuration option in CiviCrm for sending outgoing email.
a command line shell and Unix scripting interface for Drupal. CiviCRM for Drupal ships with a drush extension with a number of CiviCRM specific commands.
is for questions about CiviCRM failures in handling PayPal Instant Payment Notification messages.
Questions relating to how CiviCRM handles date and time in different timezones.