CPANEL SMTP Authentication - Strange 'from' mail - Request 2

On Cpanel:

My users use SMTP authentication:

All email goes out OK.

However, the 'from' address is mailnull@ns1.domain.com.

Any undeliverable emails are getting bounced to that alias, which get bounced back, because it doesn't exist on my servers.

Is there any way to select a different alias, or overcome this?

 

 

 

 

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