Mailchain makes it possible to easily send and receive rich-media HTML messages between blockchain public addresses through a simple, email-like interface.
All message contents & attachments are encrypted so only the intended recipient of the message can decrypt and view messages. Messages are stored off-chain to minimise the data added to the blockchain.
With Mailchain, there is no need to link emails, phone numbers or other identifiable information to communicate. The following use cases for sending email-like messages are possible with anonymity preserved.
Make accounting simpler to keep track of and account for sent and received payments.
Pay someone with Ethereum and send an accompanying message.
Application providers can send a receipt or proof-of-purchase to customers.
Send an invoice to an Ethereum account and let customers reply with a payment.
DApps can now communicate without asking users to add personal details.
Send reminders to users when an event or condition occurs, e.g. to reveal an ENS bid or when a balance reaches a high or low threshold.
Increase engagement by notifying users about a product announcements and updates.
Raise a support request letting the vendor verify a purchase was made.
There are times when you want to contact the owner of a contract or digital asset.
Make an offer to the owner of a special CryptoKitty or another digital asset (NFT).
Contact the registered owner of an ENS domain to discuss buying or using a parked name.
If you find a bug in a smart contract or need to flag an issue, you can send an encrypted message to the creator.
It's important to be able to contact account users via their account or address.
Send a message with details of your airdrop instead of sending tokens to active addresses at random.
Keep your token holders up to date on news and progress.
Nurture your community and communicate with your current or historic token holders.
Keep in touch with your community but let them remain anonymous.
Event organizers can send a ticket on receipt of payment for an event.
Send a thank you message to 'givers of Eth' for any donations.
Send project updates to stakeholders to share progress and where money was spent.