Tools

Microsoft

Message Header Analyzer

Microsoft Online Password Reset

Microsoft Remote Connectivity Analyzer

Microsoft Update Catalog

Microsoft Update Guide

Microsoft 365 Maps

Microsoft 365 URLs and IP address ranges

Exchange Online limits

Microsoft Entra built-in roles

Office 365 Recommended Configuration Analyzer

Exchange Server build numbers and release dates

Introduction to TroubleShootingScript toolset (TSS)

Health Status

Service Health Status

Service health

Azure status

Microsoft 365 Status

Microsoft 365 network health status

Visual Studio Service Status

Microsoft Fabric Product status dashboard

Third Party

Email Blacklist Check – IP Blacklist Check

DNS Checker – DNS Check Propagation Tool

RIPE Database

NSLOOKUP – DNS Look up – Find IP Address

DKIM Core Tools

SSL Server Test

SSL/TLS Client Test

Free Online .MSG and .EML Viewer

AbuseIPDB

Cisco Talos IP and Domain Reputation Center

Exchange Server Message Tracking GUI