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Ubuntu Unleashed 2013 Edition: Covering 12.10 and 13.04, Eighth Edition by Matthew Helmke

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Configuring Masquerading

Sometimes you might want to have Postfix masquerade as a host other than the actual hostname of your system. Such a situation could occur if you have a dial-up connection to the Internet and your ISP handles all your mail for you. In this case, you want Postfix to masquerade as the domain name of your ISP. For example, the following strips any messages that come from matthew.gracehopper.net to just gracehopper.net:

masquerade_domains = gracehopper.net

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