Rated 5 out of 5 stars
This is an AWESOME add-on! Works excellent!
One small thing: in the default settings all kinds of criteria are defined whether files should be compressed or not. Size of the file and percentage of compress results are such criteria. I got a message that my files didn't match the criteria. Searching on google revealed the cause of this error and I could solve it by editing the filters.
I think it would be better if the default settings were less restraining. For me compressing is not (only) about saving bandwith/filesize. It is mostly to save the recipient the trouble of having to download one file at a time. Wich in mails with many attachments is a real nuisance.
But this point is really a minor thing. It was easy to adjust the add-on to my likings.