Deployment of TXT records in the DNS to mitigate Man-in-the-Middle (MITM) attacks during mail transport.

Below is a draft technical overview based on the structure of standard IETF mail access drafts like draft-ietf-imap-imap4-06 and draft-ietf-emailcore-as-26 .

Session duration limits for IMAP/POP3 connections to prevent resource exhaustion. 5. Implementation Notes

IP ranges and domains permitted for direct relay.

Internal Draft / Preliminary Configuration Format: .txt (Plain Text) Subject: Unified Access Control for Mail Delivery and Retrieval 1. Introduction

Following the principles outlined in NIST SP 800-177 Revision 1 , this specification prioritizes:

Implementation of specialized commands (e.g., DMTP) allowing receivers to categorize and decline messages from unverified senders, similar to draft-duan-smtp-receiver-driven-02 . 4. Configuration Directives