Fyodorov-
Was this issue ever resolved for you? I just started seeing this at my company and I cannot figure out why. I have limits set to 5 mb send/receive, when user A sends user B a 3 MB email, user A get NDR. I increased user B's limit to 6MB now a 4 MB file will go through , but not a 5 MB file.

I have noticed that Exchange or Outlook (I haven't been able to determine that yet) increases the size a lot (up to 1 MB) during sending/delivery. I have proven this with other non-exchange accounts.

I use a pop3 account to send a message to the pop account and the exchange account. The pop account shows the message as being 1 KB in size, while Exchange/Outlook shows it being 5KB. I did this test over and over by forwarding the same message to the same 2 accounts and the message in the POP account only grew 2 KB every time, where as Exchange/outlook grew by much more. By the 4 test, the POP account showed the file being 9 KB and outlook being 34KB. Thats a dramatic increase, IMO.

Does anyone know why this happens? Is it additional SMTP header info? Does Exchange add something unique (proprietary) to the message?

If anyone has come across this before, please let me know what you have done, if anything.

Thx,
Nurv

Fyodorov, Andrey (Citco) wrote:
Exchange 2003 SP2. Multiple servers in different AGs/RGs.

There is an org-wide limit for all message sizes, 15MB.

User on server A on sends a message with ***2MB*** attachment to another
user on server B. Message gets rejected with NDR 5.2.3 "This message is
larger than the current system limit or the recipient's mailbox is
full".

Upon further investigation it turns out that the recipient has
sending/receiving message size limits of 10MB.

Now I am getting more reports of such NDRs, it seems like in every case
the recipient has send/receive message size restrictions (local IT staff
set those), but they are large enough to allow these messages to be
delivered.

Is this a bug?

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