MailSlurp documentation agent setup

Title: Plus addressing
Description: Inboxes have a single email address but can receive emails sent to `+xyz` style sub-addresses. Each sub-address is stored as a plus address entity.
Canonical URL: https://www.mailslurp.com/docs/plus-addresses/
Markdown URL: https://www.mailslurp.com/docs/plus-addresses.md

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