Which, I believe, is what Office 365 does (for those specific numbers).

From: [email protected] [mailto:[email protected]] On 
Behalf Of Mike Cosca
Sent: Wednesday, December 18, 2013 10:58 AM
To: [email protected]
Subject: RE: [Exchange] Quick straw poll: Email size limits

Right on - A current approach could be to advertise 25 MB as the limit and 
actually set the limit to 1.4 * 25 MB = 35 MB.  To account for the factors that 
Adam mentioned.

Mike

From: [email protected]<mailto:[email protected]> 
[mailto:[email protected]] On Behalf Of Adam Farage
Sent: Wednesday, December 18, 2013 10:50 AM
To: [email protected]<mailto:[email protected]>
Subject: RE: [Exchange] Quick straw poll: Email size limits

For most of my customers, we do 25MB. Some customers that are heavy on Outlook 
for Mac we set it a bit higher due to the ASP.NET to SMTP transcoding bloat.
> Date: Wed, 18 Dec 2013 07:26:28 -0800
> Subject: Re: [Exchange] Quick straw poll: Email size limits
> From: [email protected]<mailto:[email protected]>
> To: [email protected]<mailto:[email protected]>
>
> 10mb external (send and receive), 20mb internal
>
> Kurt
>
> On Wed, Dec 18, 2013 at 1:26 AM, Nicholas Turner 
> <[email protected]<mailto:[email protected]>> wrote:
> > We're having the monthly battle with users about how big their attachments
> > can be and I was wondering what you guys have set for the sending limits in
> > your organisations.
> >
> >
> >
> > Out limits are currently set to 20mb internal and external (of course in
> > real terms equating to about 15mb with mime encoding)
> >
> >
> >
> > I just want to send some info to users about current standards in sizing. I
> > still consider 20mb to be quite generous myself!
> >
> >
> >
> > Nick
> >
> >
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