If your vault is stored on a cloud service, such as OneDrive, you can use IFTTT to add notes by email.
How it works. You send an email to trigger@applet.ifttt.com and IFTTT creates a file in the desired directory. You can use the subject as the title and the message content as the body of the note. In addition, IFTTT can insert a link to download a single attachment.
I tested this with OneDrive, but it should work with Dropbox and Google Drive as well.
What are the limitations:
- A letter can only be sent from the same address. Solved by multiple registrations in IFTTT.
- You can only use one attachment. I haven’t figured that out yet.
- Sometimes it can take a long time to work. This is solved using Zapper, but it is more expensive.
Here is a link to my applet, I hope it works.