Hot!Increase maximum message size

Page: < 12 Showing page 2 of 2
Author
Carl Windsor_FTNT
Fortinet
  • Total Posts : 217
  • Scores: 36
  • Reward points: 0
  • Joined: 2012/05/02 03:09:16
  • Location: United Kingdom
  • Status: offline
Re: Increase maximum message size 2018/06/13 04:09:11 (permalink)
0
In summary, Exchange to Exchange SMTP uses a different format to Internet SMTP and has to be re-encoded which changes the email size.  Check the link @Abelio linked, particularly the line:
 
The common Base64 encoding adds about 37% to the original file size, meaning that an original 20MB file could exceed a 25MB file attachment limit.
 
15MB + 37% = 20.55MB
 
Hence a 15MB exchange email would be blocked by a FML with a 20MB limit as FortiMail uses the absolute size including any encoding overheads.  Take this into account when setting your limits.

Carl Windsor
Senior Director, Product Management
Fortinet
#21
Bromont_FTNT
Platinum Member
  • Total Posts : 558
  • Scores: 43
  • Reward points: 0
  • Joined: 2012/11/19 07:22:36
  • Status: offline
Re: Increase maximum message size 2018/06/13 05:24:37 (permalink)
0
Jack, 
    When you attach a binary file to an e-mail the e-mail client converts binary to ascii so there's roughly 30% increase in size which is why you need to set the size limit on the Fortimail higher than the desired file size. See the link from abelio for further details. 
#22
Page: < 12 Showing page 2 of 2
Jump to:
© 2018 APG vNext Commercial Version 5.5