What does a Masquerade Domain do?

Posted on 2005-04-19
Last Modified: 2006-11-18

Currently our Exchange Server runs on a 2 node cluster and I am currently building an SMTP server, which requires
the deafult SMTP Virtual Server to point to the SMTP Gateway.

I know you can put the IP address in the "Smart Host", to forward all mail to the SMTP Gatewa, but do you leave
the FQDN name the same "", do you have to put this in the MASQUERADE Domain?

What does the Masquerade domain do?

Question by:AJAY_MASSON
    1 Comment
    LVL 20

    Accepted Solution

    This step-by-step article describes how to specify a masquerade name for a domain. A masquerade domain replaces the local domain name in any Mail From lines in the message header.;en-us;314331&sd=tech

    In response to the large amounts of spam email circulating around the Internet many mailservers now refuse to accept mail from other mailservers if the IP address of the connecting mailserver doesn't have an associated DNS domain name which matches the name it supplies during the SMTP protocol exchange.
    Irrespective of the name of the email domains your server is hosting, in System Manager,  you should go to Default SMTP Virtual Server - Properties - Delivery - Advanced and set the Masquerade domain to the DNS name of the external IP address. If your external IP address is then, to find the DNS name, in a Command Prompt window type:-
    If a DNS name hasn't been assigned to your IP address then complain to your ISP and get them to assign one. If your server is operating behind a group of IP addresses, any of which it might use, and each with a different DNS name then it's likely the DNS name for these addresses will only differ if the leftmost part of the DNS name. Just choose one DNS name to set as the Masquerade Domain and other mailservers should accept this as close enough when mail is sent via one of the other IP addresses.

    Featured Post

    Free book by J.Peter Bruzzese, Microsoft MVP

    Are you using Office 365? Trying to set up email signatures but you’re struggling with transport rules and connectors? Let renowned Microsoft MVP J.Peter Bruzzese show you how in this exclusive e-book on Office 365 email signatures. Better yet, it’s free!

    Join & Write a Comment

    Learn more about how the humble email signature can be used as more than just an electronic business card. When used correctly, a signature can easily be tailored for different purposes by different departments within an organization.
    Check out this infographic on what you need to make a good email signature that will work perfectly for your organization.
    In this video we show how to create a Resource Mailbox in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: Navigate to the Recipients >> Resources tab.: "Recipients" is our default selection …
    This video discusses moving either the default database or any database to a new volume.

    728 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    18 Experts available now in Live!

    Get 1:1 Help Now