Re: Exchange 2003 Message size global settings

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Actually, this is what I have been observing in my [still] mixed
Exchange 2003 org, it seems like it will get better when we go to
native mode:

"Increased overhead of messages with binary attachments traveling
between routing groups over SMTP needs to be accounted for when
implementing restrictions.

For outgoing SMTP messages being sent between routing groups, Exchange
Server will render attachments in the Transport Neutral Encapsulation
Format (TNEF), which is base64 or quoted printable rather than binary.
This will cause an approximate 33 percent size increase in the
messages.

This issue can be solved by increasing the global message restriction
size by a factor of approximately one third to accommodate the
overhead.

In Exchange Server 2003 native mode, Summary Transport Neutral
Encapsulation Format (STNEF) is always used for intra-organization
e-mail. Therefore, there is no increase in the message size when going
through a routing group connector. In mixed mode, the behavior is
unchanged, because STNEF is within routing groups only.

As an example, set a Global Sending Limit of 10 MB and Global Receive
Limit of Not Set. Also, do not configure explicit per-user size limits.

Put three users in two routing groups. User1 and User2 are in one
routing group, and User3 is in a different routing group connected
through SMTP. Send a message from User1 to User2 and User3 containing
an 8-MB attachment. You may expect that User2 and User3 would receive
the message. However, the actual results are that User2, who is within
the same routing group, receives the message as expected, but the
message to User3 returns a 5.2.3 delivery status notification.

In this example, User1 did not override the Global Sending Limit with
an explicit mailbox Sending Size Limit, so the global limit is
enforced.

When the 8-MB message crossed the routing group boundary through SMTP
and arrived at the destination server, it was approximately 33 percent
larger than the original message because of the inter-routing group
SMTP increase. The message to User2 exceeded 10 MB on the inter-routing
group hop when SubmissionContLength was evaluated by the categorizer on
the receiving server. The final message had a content size equal to
11,594,558 (11 MB), and the message exceeded the 10-MB Global Limit,
thus returning the 5.2.3 delivery status notification."

this is from article:
http://www.microsoft.com/technet/prodtechnol/exchange/2003/insider/Message_Restrictions.mspx



ruski wrote:
I think you are reading it wrong. The article says:

Global setting
This setting determines the maximum size of the messages in the
Exchange 2000 organization; the messages can be incoming, outgoing, or
***internal***.


Furthermore, when messages are transmitted from server to server within
the Exchange org, they get bloated to approx. 1.5 times their original
size, because this is an SMTP transmission. So if you have your global
settings limiting mail to 10MB, and you are sending a 10MB message
(even a 9MB message) to recipients on another server, it won't go.




Leif Pedersen [MVP] wrote:
Hi,

Global settings are the maximum mail sizes for the internet. Internal the
users can be allowed to send larger emails - see
http://support.microsoft.com/kb/322679/en-us

Leif

"Slimo" <slimard001@xxxxxxxx> wrote in message
news:Oh8pXOSlGHA.884@xxxxxxxxxxxxxxxxxxxxxxx
Hi,

Is it true that the message size limits defined in the global setting are
applied to Internet e-mails even if we set a higher limit per user?

For Internal e-mail, the per user limit override global setting?

Thanks




.

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