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This module is for use with Simplenews 1.x.
By default, Simplenews assumes that only one process is sending mail at a time. This module adds the ability to send mail across several processes at once, by working around a Simplenews bug that can cause duplicate messages to be sent: #361071: Use locking to eliminate duplicate emails from concurrent simplenews cron runs.. This bug will be fixed in Simplenews 2.x, so this module is only needed with Simplenews 1.x.
This module requires the Simplenews module, and Multi SMTP. For each SMTP server that is configured, a mail sending thread is created.