How to logout/logoff from the email account ?

You don't have to login or logout of any email account, just press the home button to exit the app.

Do you also access your Yahoo account with an email application on your computer, or via webmail access only using a browser?

If the former, there is no logout/logoff for the account. The same with the iPad's Mail application.

Yes, and this in my view is a priority for Apple to sort out soon. The iPad is a very different device to the iPhone. Lots of people may be using it, and privacy is more or less non-existent.
It needs User Accounts urgently in my opinion.
(Yes, I have already sent feedback to Apple on this.)

You can turn the email account off without deleting the account (before allowing someone to access your iPad that would take it upon themselves to peruse through your email without your permission) so the account can't be checked for new messages, messages can't be sent with the account, and none of the account's mailboxes are available. When you are using the iPad, you can turn the account back on.

Yes, but is there any security there? As fas as I can see, it's just a case of anyone being able to switch it back on in settings!

If I allowed someone to use my iPad and I discovered they were changing settings or turning things on or off and/or reading my email without my permission, that would be the last time they would do so.

When you allow someone access to your computer, do you require they login to a guest login account you have available for all guests or create a new computer login account for them? If so, you are probably in the extreme minority.

Not a chance I would allow anyone to use my iPad, my iPhone, or my computer that would do this.

If I discovered this, that would be the last time.

It's just common sense Allan. With the iPad, the likliehood is that - in a family environment, say - several family members will be accessing the device. It is perfectly sensible to allow different Facebook, Twitter, email accounts to be accessible for all who want to use the iPad. It's a huge pain to have to re-login to all these services every time the user changes.
You're assuming that the device 'belongs' to one person, which as I said, unlike the iPhone, isn't true, IMO.

ipad_user wrote:
I think it is a shortage in the mail app, and i hope it will be resolve.

I agree. Everyone wants to see it and use it.

Be sure to let Apple know what you'd like to have added/changed.
http://www.apple.com/feedback/ipad.html

I am flabbergasted! The appstore account is connected to a creditcard and email address. You can reset the appstore password by email that you cannot logout from. So if logout is not possible, any ipad user can gain access to the appstore and start using the creditcard!? Would it not be extremely easy to have an option that users should type a password before opening mail? Please add this feature at the next update... Or I am missing something?

anneb63 wrote:
I am flabbergasted! The appstore account is connected to a creditcard and email address. You can reset the appstore password by email that you cannot logout from. So if logout is not possible, any ipad user can gain access to the appstore and start using the creditcard!? Would it not be extremely easy to have an option that users should type a password before opening mail? Please add this feature at the next update... Or I am missing something?

Several things . . .

1) You cannot reset the app store password by email. In Settings, you must provide your Apple ID and password to make changes and those aren't viewable elsewhere in Settings.
2) the iPad is designed and meant to be single-user. In mine, at least, which I never leave lying around for use by people I don't know and trust, the phrase " ... anyone using the iPad..." has a very limited meaning. If you are in the habit of leaving it lying about but don't want people nosing about in it, set a Passcode and lock it on leaving.
3) Anyone who picks it up can access the App Store but, absent also possessing your password, is almost certainly going to be unable to make any purchases. In addition, you can restrict the purchasing or deleting of apps through Settings.
4) Those using my iPad to check their mail are always doing it in Safari, not in Mail. And again, if I thought they were the type to go sneaking about then they wouldn't be doing it without supervision to begin with.
5) I see nothing really wrong with adding an option to lock Mail in some way via Settings > Restrictions. People would be free to use that, aware that if they should lock it down and then forget the number then they'd get no further access until they next hooked up to iTunes and underwent a total Restore.