Inbound email processing in Salesforce via Email Services + the `Messaging.InboundEmailHandler` Apex interface. Covers EmailService configuration (running user, accept-from address, attachment handling, error / failure routing), the EmailServicesAddress per-routing-address pattern, the handler's `Messaging.InboundEmail` payload (text body, HTML body, headers, attachments, in-reply-to threading), and the canonical Email-to-Case alternative for case creation. NOT for outbound email (use admin/email-templates-and-alerts), NOT for Email-to-Case flow customization itself (use admin/email-to-case-configuration). Trigger keywords: EmailServicesFunction, EmailServicesAddress, runAsUser, localPart, EmailDomainName, attachmentOption, overLimitAction, errorRoutingAddress, routing address, inbound email limit.
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