James – yes, I saw that before I sent the email. I figured it was easier to simply use 25 Megs as a limit simply to align with Microsoft’s stated limit. Even at 35 Megs, that is still smaller than what was reported by Jim as backing up his server for 20-30 minutes, which is long enough for people to notice and start calling the Help Desk. I’ve seen a 26 Meg email sent to 500 people clog up queues on a server for over an hour (we had a friendly chat with that individual). Combine that with a slow MPLS link to a site with a high user population, and all of a sudden everyone is complaining that email is not flowing AND the WAN is slow…..
ALSO…..the Exchange BPA will bark at you if your message limits are over 30 Megs. http://technet.microsoft.com/en-us/library/aa998655(v=EXCHG.80).aspx So, better to restrict email attachment size, IMHO. If you have the resources to be able to maintain an Exchange infrastructure that can send bigger messages efficiently, my hat’s off to you. ☺ Thanks, [cid:[email protected]] Jonathan L Raper, A+, MCSA, MCSE, FCC Licensed Technician, VCA-DCV, VCA-Cloud Senior Solutions Engineer [cid:[email protected]] Corporation 336.232.5244 Cisco Single Number Reach 7025 Albert Pick Road, Suite 302, Greensboro, NC 27409 www.NWNIT.com From: [email protected] [mailto:[email protected]] On Behalf Of Knoch, James W Sent: Tuesday, December 9, 2014 4:21 PM To: [email protected] Subject: [Exchange] RE: Attachment Size Redux Actually you may want to re-read that article, at least the special note below the table of limits: 2 While 25MB is the stated limit of Exchange Online Messages, an additional 10MB of space is provided as a growth allowance, due to the data overhead needed for encoding, encapsulation, compression and decompression of larger messages. Any messages over the 25MB stated limit may fail to be sent or received as a result of this limit. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Jonathan Raper Sent: Tuesday, December 9, 2014 12:52 PM To: [email protected]<mailto:[email protected]> Subject: [Exchange] RE: Attachment Size Redux LOL We had a couple of issues with people sending out large attachments and clogging up the transport queues, and that’s when I discovered that someone had set our message limit pretty high. So I did some investigating and found that Microsoft had set their limit on Exchange Online to 25 Megs. Considering we were planning to move to O365 Exchange Online, I dropped our limit down to 25 Megs, and we haven’t had much trouble since. This goes right back to “just because you can, doesn’t mean you should.” However, while you’re at it, will you please try to send an email with a 1 TB attachment and let us know how long it takes? We’re all curious. ☺ http://technet.microsoft.com/en-us/library/exchange-online-limits.aspx#MessageLimits Thanks, [cid:[email protected]] Jonathan L Raper, A+, MCSA, MCSE, FCC Licensed Technician, VCA-DCV, VCA-Cloud Senior Solutions Engineer [cid:[email protected]]Corporation 336.232.5244 Cisco Single Number Reach 7025 Albert Pick Road, Suite 302, Greensboro, NC 27409 www.NWNIT.com From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Maglinger, Paul Sent: Tuesday, December 9, 2014 1:36 PM To: '[email protected]' Subject: [Exchange] RE: Attachment Size Redux Storage is cheap, right? From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Kennedy, Jim Sent: Tuesday, December 09, 2014 12:20 PM To: '[email protected]' Subject: [Exchange] RE: Attachment Size Redux I’m ok with that, as long as they give me the resources to support it. I’m in favor of anything that is easier for them as long as it is safe and supportable. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Maglinger, Paul Sent: Tuesday, December 9, 2014 1:02 PM To: '[email protected]' Subject: [Exchange] RE: Attachment Size Redux Exchange – the new ftp server… *sigh* From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Kennedy, Jim Sent: Tuesday, December 09, 2014 11:42 AM To: [email protected]<mailto:[email protected]> Subject: [Exchange] RE: Attachment Size Redux I had a user send 8 emails of 50 MB each to 200 people in the span of 60 seconds. It didn’t crash but it created some backlogs on the queues for 20 to 30 minutes. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Mayo, Bill Sent: Tuesday, December 9, 2014 12:36 PM To: [email protected]<mailto:[email protected]> Subject: [Exchange] RE: Attachment Size Redux Are you saying that there is no upper limit for attachment size in Exchange 2010? If so, is it still true that large attachments cause performance problems? From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Michael B. Smith Sent: Sunday, December 07, 2014 7:31 PM To: [email protected]<mailto:[email protected]> Subject: [Exchange] RE: Attachment Size Redux You have a good memory. I wrote an article about that for a magazine that discussed the Exchange 2003 transport service. It doesn’t apply to modern (64-bit) versions of Exchange. From: [email protected]<mailto:[email protected]> [mailto:[email protected]] On Behalf Of Mayo, Bill Sent: Friday, December 5, 2014 12:44 PM To: [email protected]<mailto:[email protected]> Subject: [Exchange] Attachment Size Redux I know this topic has come up before, but I am running into a discussion about it again. I am almost certain that Michael B. Smith had a particularly informational post about this sometime back, but I cannot find it (swore I saved it, but can’t find it—also searched the current archives unsuccessfully). It is my recollection that it explained how it delayed delivery of other mail, but most importantly, that there was some maximum over which Microsoft would not support it. Did I dream all that, because I can’t seem to find this documented anywhere? I would greatly appreciate it if anyone someone has that info, whether in my recalled format or elsewhere. I would also appreciate any other links or individual information anyone has on the topic of how big is too big for email attachments. I have all the old “straw poll” messages, so I know what people are/were using as the limit, I am looking more for documentation of the potential issues caused by allowing larger attachments. 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