Peer-initiated Invitations are a Marketing Email campaign where you get customers to invite their friends and family. There are some caveats to consider about this marketing method.
Peer-initiated invitations are a common way of launching a new business and gain awareness. If done right they can enable your subscribers spread the word about your service and grow your user base. An aggressive invitation system can backfire, and your invitations will be filtered or blocked. SendGrid customers who implement a peer-initiated invitation system must abide by the following requirements:
You increase the odds of your invitations reaching the recipient when you structure your systems and processes to send the right message, to the right person, at the right time, with the right frequency. If you don't, your messages will be marked as spam and your marketing results will suffer.
SendGrid also strongly recommends: