checking for messages in mail

[joec144]

I just updated from Yosemite to ElCapitan. All appears to have gone well and everything is working. One issue I have and cannot seem to find the answer to is in Mail. I have all my accounts set to manual. In Yosemite when I opened the mail program it would NOT check for new mail until I clicked on the GET MAIL button. Then all the mail accounts would fetch the new messages. Now, when I open the mail program it automatically checks the accounts for new mail without me clicking the GET MAIL button. All the accounts are still as they were, to be checked manual. This is not a very big deal but it is annoying to me. Is there a fix for this or is this the way it will be. Thanks and sorry if this has been answered already but I cannot find it.