I figured out what had happened here. It turns out someone had cloned the SQL sever without my knowledege and that new server was the one sending the emails....

No progress on this issue yet, but a couple more pieces of information: I have checked the msdb sysjobs and sysjobschedules tables for suspect entries, but there's nothing unusual...

Got it. Thank you very much!

opc.three,

You were right. If an account with the dbcreator server role creates a database, they do become the owner and have full access. I'm not sure what I...

Thanks for the responses guys.

I originally tried adding the account to just dbcreator, but it seems that this does not actually make the account "owner" in this case. I...