Technical reference

How mail flows through Footer365The path a message takes from your mailbox, through the Footer365 relay and back into Exchange Online, and the headers and rules that keep it from looping. What Footer365 creates in Exchange OnlineThe exact connectors, transport rules and organisation settings Footer365 creates or changes in your tenant, how to find them, and why they should not be edited by hand. Permissions Footer365 asks for, and whyEvery permission requested in steps 1 and 3 of the setup wizard, the optional one write-back to Entra ID asks for, what each one is used for, and what Footer365 cannot do in your tenant. Using Footer365 alongside another email gatewayHow the Footer365 rule and connectors sit next to Mimecast, Proofpoint, Barracuda or any other outbound gateway or connector you already use, and what to check before changing anything. SPF, DKIM and DMARC with Footer365The SPF include Footer365 needs and where it goes, what happens to DKIM signatures when a signature is added, and how to check DMARC alignment. Encryption, S/MIME and rule priorityWhy a protected message cannot be signed, what the relay does with one, and how to order your mail flow rules so mail gets both a signature and encryption. The Footer365 APIHow your own systems call the Footer365 API with an API key, what version 1 can do today, the rules a change to someone's details follows, and the rate limits and errors to expect. Which messages get a signatureThe kinds of message Footer365 signs and the ones it deliberately passes through unchanged, including protected mail, delivery reports, automatic replies, calendar items, Microsoft 365 notifications and internal mail. Mail from your CRM and other appsWhich mail a CRM, help desk or website sends as your people is signed by Footer365, how to check one message from its headers, the ways to set an app up so its mail is signed, and how a marker in a template sets where the signature goes. Delivery status codes from the Footer365 relayEvery temporary (4xx) and permanent (5xx) response the Footer365 relay can give Exchange Online, what each means, what to do, and how to find them in a message trace. Outlook client support and the add-inWhich Outlook clients show the signature while composing through the Footer365 add-in, what happens in Apple Mail and Outlook 2016 or 2019, which events it uses, the Mailbox 1.10 requirement, and which mail is covered with mail flow and with the Outlook add-in only. What happens to mail during an outageWhat happens to your email if the Footer365 relay is unreachable or asks Exchange to retry, why mail is delayed rather than lost, how planned maintenance is announced, how to be told by email or feed, and what to do while it lasts. Data and privacyWhat Footer365 reads from Microsoft 365 and from your mail, what it stores and for how long, including campaign click data and what is sent to HubSpot when you connect it, and where to find the sub-processor list and security statement. Removing Footer365 from your tenantWhat Footer365 removes from Exchange Online when a subscription ends, how to revoke its access by deleting the enterprise application, and what to check afterwards.