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WHM & CSF - Gmail SMTP connect () failed error

Posted by negraru on Fri, 5 Jan 2018

Gmail SMTP connect () failed error using smtp.gmail.com and 587 port with TLS in cPanel

I solved the Gmail SMTP connect () failed error adding user(s) to CSF:

Go to:

CSF Firewall Configuration
SMTP Settings
Whitelist user(s) in variable "SMTP_ALLOWUSER"
SMTP_ALLOWUSER: cpanel,user1,user2

(user is cPanel username)

If still doesn't work:
Go to:

Home » Server Configuration » Tweak SettingsDocumentation » Mail
Select "Off" under:
Restrict outgoing SMTP to root, exim, and mailman (FKA SMTP Tweak) [?]

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