Compressing is the only thing I know. Or ask the recipient if they have an FTP site you could use.
I would only ask why email in 2016? Dropbox is much easier for this kind of thing. Even the free account should give you plenty of space to connect with your end client.
That's true. Even though I use cloud storage for personal stuff I hadn't considered it for work related stuff.
Yea, and it get's around trying to e-mail files that some e-mail servers strip out like DLL's or EXE's.
Yes, rolling back features is an old trick that can still be used to reduce part file size.
Take any part from the Training folder and the part file can be reduced easily by 30 to 40%
I created the Feature Toggler macro solely for this purpose.
Further you can use the Pack-n-Go program to zip up a set of part files or all files of an assembly at once.
Both programs can be downloaded from here.