Encoding the email for transmission can really balloon its size. In particular, the less text-like the attatchment (jpg, zip, whatever) the more likely it is to cause this problem.
UUEncoding (deprecated, and not used much any more) and MIME/base64 encoding are the "culprits", although HTML-formatted messages can cause some growth in the text portion of an email, since frequently the text of the message is duplicated in separate MIME sections, one with HTML formatting tags, and one without. See, for instance, this: http://en.wikipedia.org/wiki/Base64 Kurt On Tue, Sep 20, 2011 at 11:32, Damien Solodow <damien.solo...@harrison.edu> wrote: > Doh! > > Here’s what it ended up being; the overhead the Brightmail gateway was more > than the 30% the said to add; it was closer to 38%. That’s what I get for > trusting Symantec documentation. ;) > > > > DAMIEN SOLODOW > > Systems Engineer > > 317.447.6033 (office) > > 317.447.6014 (fax) > > HARRISON COLLEGE > > > > From: Campbell, Rob [mailto:rob_campb...@centraltechnology.net] > Sent: Tuesday, September 20, 2011 1:46 PM > > To: MS-Exchange Admin Issues > Subject: RE: NDR tracking? > > > > Set the Protocol logging level on the receive connector to “Verbose”, and > check your smtp protocol logs for the message rejection. > > > > From: Damien Solodow [mailto:damien.solo...@harrison.edu] > Sent: Tuesday, September 20, 2011 12:25 PM > To: MS-Exchange Admin Issues > Subject: NDR tracking? > > > > Ok, I’m having an issue with an externally originating message bouncing and > I’m apparently having a brain fart. Hopefully someone can help me clear the > air. > > > > Use from Gmail is sending a message to one of our recipients; total > attachment size is about 9.8 MB. Our SMTP gateway (Brightmail) allows > attachments of up to 10240 KB, and is accepting the message from Gmail. > > > > However, when it goes to hand it off to our Exchange 2010 SP1 HT server, it > gets a 5.3.4 Too large. I checked the receive connector as well as the Org > level settings for Transport, and it is set to allow messages of up to 10240 > KB. I found a KB article for Brightmail gateway saying that due to format > conversion, etc, the message passed through to the downstream server can be > up to 30% larger. So, I updated the receive connector and the Org level > settings to 13312 KB (10240 * 1.3). > > > > However, the message is still bouncing. What’s even more frustrating is that > the Message Tracking and Tracking Log Explorer don’t have any record of the > message. On both Hub Transports I increased the Diagnostic Logging for > MSExchangeTransport\DSN and MSExchangeTransport\SmtpReceive to High but > nothing in the logs. > > > > What log(s) do I need to increase to find out how big the message is when > the HT tries to accept it so I can see how large it needs to accept? > > > > Help me Obi-Wan… > > > > DAMIEN SOLODOW > > Systems Engineer > > 317.447.6033 (office) > > 317.447.6014 (fax) > > HARRISON COLLEGE > > 500 North Meridian St > > Suite 500 > > Indianapolis, IN 46204-1213 > > www.harrison.edu > > > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe exchangelist > > ************************************************************************************************** > > Note: > > The information contained in this message may be privileged and confidential > and > > protected from disclosure. If the reader of this message is not the > intended > > recipient, or an employee or agent responsible for delivering this message > to > > the intended recipient, you are hereby notified that any dissemination, > > distribution or copying of this communication is strictly prohibited. If > you > > have received this communication in error, please notify us immediately by > > replying to the message and deleting it from your computer. > > ************************************************************************************************** > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe exchangelist > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to listmana...@lyris.sunbeltsoftware.com > with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist
