Does your ISP or webmail choke you off when trying to email a pal a large email attachment? Well, there's good news for you. You can now offer your pal the option to download the attachment from your third party cloud storage service using Thunderbird's Filelink option. It's very COOL! I think it's been in the last few versions of TB, but I didn't notice it till today. I've been distracted lately.
Anyway, I linked my TB to use my Dropbox account, which requires an extension be installed. However, if you use one of the TB provided options, you won't need to install an extension, just sign up for an account at one of the supported services.
Read more about Filelink here --> https://support.mozillamessaging.com/en-US/kb/filelink-large-attachments
Ain't technology wonderful?!