Timestamp to Send/Recieve Mail in backdate.

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If you want to send an email in back date to anyone then you can go through the link.

http://humanchimp.co.uk/419eater/backdate/

Steps to follow:
1. Click on the above link.
2. Then Click on "here" option (open in new tab) written right to the Timestamp.
3. Then Select the credentials as you want and click on "generate" button. Timestamps for the mentioned
    time will generate on the page as figured below:

+1 Hour	1338793828
+1 Day	1338876628
+1 Week	1339395028
+1 Month	1341382228
+1 Year	1370326228

(blue entries are the timestamp and will generate according to you mentioned the time you wan to generate)
4. Then copy any of them as you want to reflect the time in the e-mail you will send, and paste into the first
    field "TIMESTAMP" (onto the first page).
5.  Enter e-mail address in the "TO" field whom you want to send the email.
6.  Enter your e-mail address in the "FROM" field.
7.  Then  Enter the subject in the "SUBJECT" field.
8.  The type your "message in the "MESSAGE" field.

Note: 
1. Probably this will work only for Gmail mailbox.
2. This will subjected to knowledge only. I will not responsible for any offense made by you.