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The guy behind Post SMTP, the most powerful SMTP plugin with more than 100,000 active installs:

Incorrect authentication data

SPF Some users reported that creating an SPF record solved the issue. Cpanel Possible solutions: Login to CPanel > Tweak Settings > All> “Restrict outgoing SMTP to root, Exim, and mailman (FKA SMTP Tweak) and switch it from “On” to “Off”. The problem may be the cPHulk (login blocking software). So adding the external IP …

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Forums are closed

I’m doing a bit of order and closing this forum. There is no point giving the same support level here if I can do on the plugin official support forum located here: Meaning if you want support head over to the link above. I’m thinking of offering more premium support with access to a …

Forums are closed Read More »