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  5. The server responded: 550 Access denied - Invalid HELO name

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The server responded: 550 Access denied - Invalid HELO name Print

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Please make sure that you've turned ON authentication for the outgoing mail. The option is in your email account settings. 

Go into the advanced settings and for the outgoing server, and check "Outgoing server requires authentication, use same settings as incoming server" - that should solve your issue.

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