Connect campaign stats in one click

You send your first campaign through Mailgun or SendGrid and want its opens, clicks and bounces. Usually that means creating webhooks in the provider's dashboard, copying a signing key back and hoping you picked the right events.
The enemy is a setup step that stands between you and your own campaign numbers.
Part of the Email Campaigns launch. Campaign settings lists your Sending accounts in one place. Each row shows whether delivery stats are on, and Make default picks the account new campaigns start with. Set up stats opens a window for that account. There, Connect uses the API key already saved on the account to create the event webhooks in Mailgun or SendGrid and saves the signing key for you. If the key may not manage webhooks, Set it up by hand lists the steps, with Where do I find this? links to the docs.

A missing postal address is a warning, not a stop. Campaigns go out without it and the footer leaves the line out, though anti-spam laws such as CAN-SPAM still expect one in marketing emails.
When a provider refuses a send, the error says why in plain words, such as a rejected API key or an unverified sender, and shows the provider's own reason next to it.
Try it: open Emails, then Campaign settings. On a Mailgun or SendGrid account, click Set up stats, then Connect.
Documentation