Mail Security, Deliverability & Blacklists

A comprehensive toolkit dedicated to auditing mail server configurations, validating authentication records like SPF, DKIM, and DMARC, checking spam blacklists, and managing IP delisting requests.

Authentication & Policy Generators

Tools used to rapidly build, check, and validate DNS cryptographic signing and mail policy records:

• Quick MX Auth Tool v0.36 by Slake: A rapid script for checking MX routing and basic SPF configurations.
• SPF Wizard - SPF Generator DNS tool: A form-based generator to quickly build and validate SPF TXT records without syntax errors.
• Free DMARC Record Generator - Create a DMARC Record - dmarcian: A wizard that helps construct DMARC reporting and enforcement policies step-by-step for domain protection.
• All-in-one SPF/DKIM/DMARC Wizard: A consolidated dashboard for setting up and verifying all three major mail authentication protocols.
• easydmarc.com/tools/spf-record-raw-check-validate: Validates raw SPF records to ensure syntax correctness and that they do not exceed evaluation limits.

Blacklists, Validators & Encryption

Utilities for testing sending IP reputation, scanning spam blacklists, and evaluating server encryption standards:

• MultiRBL.valli.org - Blacklist, Whitelist and FCrDNS check tool: An extensive multi-blacklist checker that tests IPs across public RBLs and verifies Forward-Confirmed reverse DNS.
• Email Blacklist Check - See if your server is blacklisted: The industry standard for checking if a mail server IP or domain is listed on major spam blacklists.
• DKIM, SPF, and Spam Assassin Validator - dkimvalidator.com: Generates a temporary email address to test inbound/outbound mail flow, providing a full breakdown of authentication alignment and spam scoring.
• DKIM Record: A straightforward tool to validate published DKIM public keys directly in DNS.
• Reputation Checker: Cisco's platform for checking the global email and web reputation posture of an IP or domain.
• Mailserver encryption test (STARTTLS, TLS and PFS) · SSL-Tools: Performs deep inspection of mail server encryption capabilities, checking STARTTLS, TLS versions, and Perfect Forward Secrecy.

IP Delisting Portals

Official support pages, troubleshooters, and direct submission forms for removing IPs from major blocklists:

• Gmail IP Delist 2: Official Google troubleshooter for resolving delivery errors to Gmail users.
• Microsoft IP Delist 2: Official documentation and guide for removing IPs from Microsoft's blocked senders lists.
• Microsoft IP Delist 1: The direct portal interface to request removal from Office 365 blacklists.
• Sender Contact Form - Gmail Help: Direct escalation form for persistent, high-volume delivery issues with Gmail.