This is the NickServ setting. For the ChanServ equivalent, see Autoop (ChanServ)
Autoop is a NickServ setting which applies to NickServ accounts. It can be set either ON or OFF. If turned off, services will not automatically set any modes on you when you're logged in and join channels unless you are permanently banned from the channel in the form of an Akick. To turn this setting off, simply log into services and issue the following command:
/msg NickServ SET AUTOOP OFF
By default, this setting is turned on when your NickServ account is created as the vast majority of users will want to be automatically opped or voiced by services whenever they join a channel that has an access list entry for their account.