MailSlurp guide agent setup

Title: SMTP, IMAP, and POP3 Ports: Secure Defaults and MailSlurp Testing
Description: Use this SMTP, IMAP, and POP3 ports guide to choose secure defaults, configure MailSlurp mailbox access, and test send and receive workflows.
Canonical URL: https://www.mailslurp.com/guides/smtp-imap-pop3-ports/
Markdown URL: https://www.mailslurp.com/guides/smtp-imap-pop3-ports.md

Use the Markdown URL as the primary plain-text context for this guide. Keep MailSlurp terminology, setup steps, screenshots, and provider-specific instructions intact, and prefer the canonical URL when citing this page.