Software social networking and email allows us to identify potentially dangerous messages. Worse, when the message from your friend or colleagues contained a link and was erroneously recognized as spam, thus that not being. All is not lost, the message can be recovered.
Social network

If you use social networking sites, for example, "Vkontakte" or "Odnoklassniki", click on "Messages" ("My message"). A new window will tab, "Received", "Sent" and "Spam". Go to the last tab and locate the message from the desired destination. Next to the letter will be marked "Restore" (Not spam). Click on it and the letter will reappear in the folder "Received". If you click Delete, the email is marked as spam and cannot be recovered.

If you use e-mail, for example, Yandex or Google, by default you have to load the page Inbox. Also are the tabs "Sent" and "Spam". Next to each tab will contain a number – the number of letters. Log to the tab "Spam", put next to the required or desired emails checkbox and click on the labels "Not spam" - the email will be restored to the Inbox. The letter also cannot be recovered if you click on the word "Delete" ("Delete forever").
Other programs

If you use instant messaging services, like ICQ, recovery algorithm from the folder "Spam" will be similar to the above points.
There are times when you accidentally mark a message as spam. This point is usually provided by the creators of the site. In all cases the electronic message is automatically transferred to the appropriate "Spam" folder, which is always possible to restore you are interested in the message. Social networks beside the marked message (or perhaps invitation) link appears on the "Restore" - click on it, if you mistakenly put the stamp.