I'm getting Email errors in my admin log

[BAJI26]

Admin Email Notification Sending Failed - PHPMailer Exception - SMTP Error: Could not authenticate. (Subject: WHMCS Admin Failed Login Attempt)
Email Sending Failed - SMTP Error: Could not authenticate. (User ID: 7 - Subject: [Ticket ID: 379546] New dedicated server)

 

Just tried sending another one and I get

 

 

Email Sending Failed - SMTP Error: Could not authenticate.
Email Queue Processing Completed

[BAJI26]

I think I fixed it!

 

Changed the Mail Encoding to Based64

Edited June 29, 2016 by BAJI26

[BAJI26]

Ok just saw somemore emaill errors in the log

 

Email Sending Failed - Could not instantiate mail function. (User ID: 7 - Subject: [Ticket ID: 379546] New dedicated server)
By *** - *** (30/06/2016 07:54)

Admin Email Message Sending Failed - PHPMailer Exception - Could not instantiate mail function. (Subject: WHMCS Automatic Setup Successful)
By System - **** (30/06/2016 04:45)

Email Sending Failed - Could not instantiate mail function. (User ID: 7 - Subject: Hosting Server Account Details)
By System - **** (30/06/2016 04:45)

[WHMCS John]

Hi,

 

The 'Could not instantiate mail function' error means you are using the PHPMail() 'Mail Type' option. The PHP Mail function uses the servers "mail" function which is not always reliable, nor does it generate a friendly error. Could not instantiate mail function means that when attempting to send the email, the server rejected it.

 

Switching to SMTP under Setup > General Settings > Mail tab would allow you to have more descriptive errors when an issue does occur and is usually more reliable when sending emails.