Recently I had a manager complain that emails from some of our SQL 2005 servers were displaying different "From" aliases. These emails were being sent via DB Mail in jobs that were on all servers. I thought all the servers were configured the same; the same email account was being used on all, the same Exchange server, all the profiles had the server name as the display name.
However I missed one thing. Two servers were using Windows Authentication of the database engine and two were using Anonymous. The two using Windows Auth picked up the display name from Exchange, the 2 using Anonymous used the display name of the DB Mail profile.
A small thing, but useful in the future if I need to change the display name of email sent from a server.