Some alternatives to email:
--| Use an Acrobat.com account
Free accounts are available. Whlle fully functional free accounts have less "elbow room" than a subscribtion account.
https://www.acrobat.com/main/en/home.html
--| Use Adobe's online service "SendNow"
https://www.acrobat.com/sendnow/en/home.html
Or, both; an Acrobat.com Plus account coupled with SendNow is really rather versatile.
If traditional email is the only option then you'll have to slim down the Portfolios.
While most email "systems" now support up to 25MB of attachments there are still many that impose a smaller value.
Unless everyone uses the same system there could be distribution issues.
Be well...