Are your emails getting blocked by MailChannels, MailChimp, SpamAssassin etc?
It could be because you are missing the "message-id" field in your message header due to increased scrutiny and spam detection measures implemented by your ISP, Google, Hotmail etc.
This extension creates a unique message-id for every email to avoid being detected as spam.
Tested with OC2.3.0.2 but should work with other versions too.
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