If I attach something to a mail which I send to 100 people and then each of them might then forward it again somewhere, how many copies of the attachment are the on the servers?

When would a new copy be created?

  • 3
    Attachment handling is probably one of their trade secrets. I imagine they minimize copies as much as possible, but distribute them to each server close to where the recipients usually access their mail. But why do you care?
    – William
    Aug 12, 2010 at 22:28
  • @William: a general wondering.
    – Lazer
    Aug 13, 2010 at 7:56

1 Answer 1


New copies are created once the email is sent. The file(s) only exists on the server until the email is actually sent. That's why you can get bounceback messages because an email is too large in size from recipients. The attachments are actually embedded within the email itself when it's sent (and forwarded).

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