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Hi Emils,
Thanks for the response.
As it turns out I had everything configured correctly. But because my digital Ocean account was quite recent I had to contact support to request that they lift an SMTP restriction. As soon as it was lifted my Wordpress site could send outgoing mail.
Regards,
Chris
There can be a couple of things. Check PHPmailer config. Can you show your PHP mailer config ( remove sensitive data) ? Can you checked telnet connection to your zoho server?