03-13-2008 04:29 PM
My company IronPort has limited outgoing mail attachment size to 13MB. Recently, I found that when I send a mail attached with a rar file (10MB), the IronPort has detected the message size is over 13MB. Actually, the message body contains few words and the attachment size is around 10MB.
I don't understand why when I attach a rar file in the mail. the mail size will be increased around 33%. I also tried sending rar in yahoo mail and got the same results. Do anybody know the reason??
03-13-2008 06:41 PM
Binary files must be BASE64 encoded before being sent via e-mail. BASE64 is a 6-in-8 encoding, meaning that the file size is increased by 33%. The RAR file may be only 10 MB sitting on your disk, but it's 13.3 MB once it has been encoded for transit.
03-14-2008 03:41 AM
I've got it. Thank you very much.
03-14-2008 05:50 PM
Have a question here:
Let's say I want to completely remove executable, and I have policy to strip attachment file type executable.
How can I also strip the attachment if the executable is compressed (.zip or .rar)?
Will IronPort be able to detect? By binary?
Thanks,
ezekiel
03-14-2008 07:11 PM
How can I also strip the attachment if the executable is compressed (.zip or .rar)?
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