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I'm using SMTP to the brand server. Port 465. SSL
I'm testing and sending to several email addresses. It says they are sending ("Email has been sent!"), but none are arriving. None arrive when I send to my full list, either (one email).
I do have the cron set up, five minute intervals.
Please check with your host if they restrict sending of emails via third party SMTP. Some hosts restricts sending emails via third party SMTP.
I just checked my WHM, and the SMTP restrictions are not enabled.
I've got it working. There was an extra space in one of the fields from copying and pasting.