File Attachment Size Changing

[scotty]

Version: 2008
Operating System: Mac OS X 10.5 (Leopard)
Processor: intel
Email Client: pop

Hope someone can help.

I made a Powerpoint [.pptx] which measured 9.1MB. I then compressed it to get a zip file of 8.2MB.

The file was then attached to an Entourage email for sending. I noticed that the attachment file size had increased to 11.1 MB! This size was confirmed when the email bounced back from intended recipient due to it being over 10 MB in size.

I then tried attaching the file to an Apple Mail email, and found the attachment to have 'retained' it original size and went to the intended recipient without any problems.

Any ideas why the attachment increased in size when attached to an Entourage email?

No big deal I suppose as I can just use Apple mail instead. Would just like to know what the cause is.

Cheers....Scotty

 

[Barry Wainwright]

Version: 2008
Operating System: Mac OS X 10.5 (Leopard)
Processor: intel
Email Client: pop

Hope someone can help.

I made a Powerpoint [.pptx] which measured 9.1MB. I then compressed it to get
a zip file of 8.2MB.

The file was then attached to an Entourage email for sending. I noticed that
the attachment file size had increased to 11.1 MB! This size was confirmed
when the email bounced back from intended recipient due to it being over 10
MB in size.

I then tried attaching the file to an Apple Mail email, and found the
attachment to have 'retained' it original size and went to the intended
recipient without any problems.

Any ideas why the attachment increased in size when attached to an Entourage
email?

No big deal I suppose as I can just use Apple mail instead. Would just like
to know what the cause is.

Cheers....Scotty

this is perfectly normal - in order to send a binary file it has to be
encoded to go through the mail transport system. This causes the file
size to grow, usually by about 20-30%. This must happen for any mail
client sending such a file. My guess is that Mail.App is reporting the
pre-encoded size which is why you don't see the file size grow in mail,
but it must still be encoded for mil to send the file as well.

 

[scotty]

Barry,

many thanks for the prompt answer and for making it such that even I can fully understand it.

Much appreciated.

Regards....Scotty