Skip to content
Read more about the article How to fix [Message=421 4.3.2 Service not available] error?

How to fix [Message=421 4.3.2 Service not available] error?

  • Post author:Amit Singh
  • Post published:August 22, 2022
  • Post category:Microsoft 365
  • Post comments:0 Comments

Recently we have faced an issue in Office 365 test account where we cannot send email from our Office 365 test account to our On-Premises Exchange Server.  Note: Our On-Premises Exchange…

Continue ReadingHow to fix [Message=421 4.3.2 Service not available] error?

Recent Posts

  • Best Practice and Steps for converting Regular mailbox to Shared Mailbox without any license?
  • Rackspace ‘Security Incident’ Causes Hosted Exchange Server Outages
  • Rackspace Hosted Exchange Environments Impacted By Security Issues
  • How to Develop a Disaster Recovery Strategy?
  • How To Migrate Exchange Server 2012-R2 Essentials to Exchange Server 2022 Essentials

Recent Comments

  • Best Practice and Steps for converting Regular mailbox to Shared Mailbox without any license? - Amit Singh on How To Migrate Exchange Server 2012-R2 Essentials to Exchange Server 2022 Essentials
  • Which Windows Server 2022 Edition Is Right for You? - Amit Singh on How to Disable OWA for New Users?