Mail flow RRS feed

  • Question

  • Hi,

    I want to know about mail flow in Exchange 2016. want to know that if a user sends an email with 1MB attachment to 10 users of same exchange organization. does this Mb attachment and email will be stored in all 10 mailboxes(means will it take storage space for all 10 users) or Exchange saves the mail in one location and provide reference link to all mailboxes?



    Monday, September 25, 2017 1:07 PM

All replies

  • Yes there will be 10 copies of that message - the message and attachment will be stored in each mailbox.

    Single Instance Storage (SIS) is no longer used, starting back in Exchange 2010, because disks are cheap.

    My Blog: http://exchangeitup.blogspot.com My Twitter: http://twitter.com/ExchangeITup

    Monday, September 25, 2017 1:25 PM
  • Hi Sajid,

    Exchange Server won't create a reference link itself instead number of copies will be created. So, the solution is you should store file on OneDrive or somewhere else and share the reference link;


    Please click on "Mark as Answer" and “Vote as Helpful” on the post that helps you, this can be beneficial to other community members.

    Monday, September 25, 2017 2:27 PM
  • Hi,

    Thanks for contacting our forum. It’ll copy to every single user’s mailbox in the DB.

    Per my knowledge, the SIS was no longer used in Exchange 2010 or later. Removing SIS and redesigning the database schema to permit sequential reads resulted in massive performance improvements (as much as 70% less disk IO for typical behavior).

    Hope it helps.


    Jason Chao

    Please remember to mark the replies as answers if they help.
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    • Proposed as answer by Jason.Chao Wednesday, September 27, 2017 9:54 AM
    Tuesday, September 26, 2017 2:38 AM