pueblohost
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Google Apps Mail mail Sending Failed - SMTP Error: Could not authenticate.
pueblohost replied to a topic in Using WHMCS
Hi everyone, I had this problem, i searching and searching I found no answer, but in my case the problem was the firewall on my local server (CSF) was blocking ports post, so I fixed it as follows form: In the Firewall settings sigueinte find the line: SMTP_PORTS = 25, 465, 587 change it SMTP_PORTS = 25