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I remember reading somewhere that any binary files sent attached to an email must be first UUENCODEd, which makes the file sizes considerably larger, hence why it's better to send files via some other direct-transfer means such FTP, Skype, etc.
How much larger will UUENCODE make my binary files?
You forgot to account for the SOL/length character (an
M
for a "full" line) that starts each line of encoded data. Line termination can be either CR+LF or just LF. – sawdust – 2013-03-20T02:18:25.103Good point. Each extra char per line would add 1.5% to the final size. – Hennes – 2013-03-20T12:56:50.610