Why do I receive duplicate copies of e-mail messages?
There are three reasons why you might receive multiple copies of incoming e-mail messages. This page describes the reasons; please contact us if this page doesn't explain why it's happening to you.
Multiple accounts in your mail program
If it happens with all mail, and you use an e-mail program like Outlook, Eudora, Thunderbird or Mac OS X Mail on your own computer, you may have accidentally configured that program to have two separate accounts checking the same mailbox.
One address forwarding to multiple mailboxes
A second possibility if it happens with all mail is that you've set up a single forwarding address on our servers to forward to two different mailboxes.
For example, if you set up sales@example.com to forward to both president@example.com and ceo@example.com, and you read both the "president" and "ceo" mailboxes, you'll see two copies, even though the sender only sent one copy.
The sender is sending to multiple addresses that deliver to the same mailbox
If it only happens with mail from one sender (or from a small number of senders), a third possibility is more likely.
If you've set up two forwarding addresses (or a catch-all forwarding address) to deliver mail to the same mailbox, and the original sender addressed the message to those two different addresses, you'll get two copies.
For example, if you set up both president@example.com and ceo@example.com to forward mail to the_boss@example.com, and someone sends a single message that's "To: president@example.com, CC: ceo@example.com", you'll get two copies.