I'm sure someone will correct me or give you the finer details....To deliver something via SMTP format, it needs to be converted to text and 7-bit IIRC (if it is not text, then it needs to be encoded into a text format)
So if you have an 8 bit chracter (anythin above US ASCII 127) to send that file it takes twice as many characters, hence twice the size. Then if you add in the fact that exchange holds two copies of a RTF or HTML message (compresed) and may send both when sending via SMTP (by default) Further info here http://www.google.co.nz/search?hl=en&q=why+is+smtp+7+bit&meta= If your send/receive level checking is at the exchange mailbox level then what I have explained about SMTP is irrelevent. If the limit checking is at the IMS level then that would explain why a 5MB file won't get through. In the excahneg store it is 5MB, but at the SMTP conector it could well be 6 0r 7MB HTH DeanC -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nurv Sent: Tuesday, 29 August 2006 12:36 To: Exchange Discussions Subject: Re: message size NDR is driving me nuts 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? > > _________________________________________________________________ > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange > To subscribe: http://e-newsletters.internet.com/discussionlists.html/ > To unsubscribe send a blank email to [EMAIL PROTECTED] > Exchange List admin: [EMAIL PROTECTED] > To unsubscribe via postal mail, please contact us at: > Jupitermedia Corp. > Attn: Discussion List Management > 475 Park Avenue South > New York, NY 10016 > > Please include the email address which you have been contacted with. > > > > _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange To subscribe: http://e-newsletters.internet.com/discussionlists.html/ To unsubscribe send a blank email to [EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. 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