Please bear with me, I'm a stackexchange newbie.

I have to manage a configured `SQL-Server version 2005` and have setup Database Mail successfully - test mail works. 

Also I've changed the agent service to a domain user with (currently) domain admin and db admin privileges.

Now I'm getting numerous login errors for this user

> (error 18456 state 28000) 

when running jobs with notification. Any idea how that can happen, when the agent service can be restarted without problem?

I've searched the web extensively but the only answers I can find are related to wrong passwords.

Pls advise

Crossover