When your collaborator sends you a new inbound email message about the project you share with them you would feel pretty bad if you were always the last to know what is going on.
Send and receive email via a custom Nekton email address at "Nektonmail.com". This is great for triggering off of emails and sending custom emails. (Max of 10 email sends per hour.) Have direct access to your own email servers? Check out our IMAP and SMTP services!