For canceling of sending the e-mail it has to be executed one or the other conditions: you should use Gmail service or Microsoft Outlook program 2007 or 2010, and at the same time to have the Microsoft Exchange Server 2000, Exchange Server 2003 or Exchange Server 2007 account. In all other cases it is not possible to withdraw the sent letter.
The problem of obtaining the password from mail by the login rises before forgetful users quite often. But all modern mailboxes have function of password recovery by the login. Also this function is used by hackers for cracking of accounts.
Modern accounts of e-mail serve not only for sending and a receipt of letters, but also for an entrance to a huge number of services. The forgotten password at the same time can limit possibilities of the user considerably. However it is possible to restore it in at least three ways.
E-mail is a convenient and operational way of transmission of messages. At registration of e-mail some users trifle with the choice of a nickname. Therefore in the future there is a need for change of a name of a mailbox.
Any Internet user pretty fast gets used to check the mailbox several times a day. Many get to themselves several mailboxes. It is not really convenient to open at first the browser, and then in turn all pages. That it was not necessary to do it, it is possible to collect to take out all mail in one box, and a label of an e-mail client or the necessary page on a desktop.