I am unable to add deliverybility servers in my mailwhizz how i can do that ? While adding deliveritivit severs i am getting this error please help

You should double check SMTP setting credentials. Look like username wrong or invalid password.
 
You need to go in WHM to tweak settings. search smtp. By the option: Restrict outgoing smtp... click on 'off' (meaning that it is not restricting anymore)
 
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