Normal Course of Events
Generated: Email created by GoSweetSpot and queued to be sent.
Sent: Sent from GoSweetSpot.
Processed: Received by our mail provider, ready to be sent to the receiving mail server.
Delivered: Arrived to the mailbox of the receiver.
Open: Receiver has opened the email.
Click: The receiver has opened the tracking link in the mail.
Other Possible Events
Dropped: The email can drop for a few reasons - Invalid SMTPAPI header, Spam Content, Unsubscribed Address, Bounced Address, Spam Reporting Address, Invalid, Recipient List over Package Quota.
Deferred: Receiving mail server temporarily rejected the message.
Bounce: Receiving mail server could not or would not accept the message.
Spam Report: Recipient marked the message as spam.
Unsubscribe / Group Unsubscribe: Recipient opted out of all future emails.
Group Resubscribe: Recipient opted back into all future emails.
For further and advanced details please see:
https://sendgrid.com/docs/API_Reference/Event_Webhook/event.html#-Events
https://documentation.mailgun.com/en/latest/api-events.html#event-types