Creating MX records for a subdomain

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The Dreamhost web hosting thread below was started by on 2010-08-06 19:42:30:

I’d like to be able to assign users either a second-level domain (opportunityjunction.org) email address or a third-level domain (training.opportunityjunction.org) email address, so I need to add the necessary MX records for training.opportunityjunction.org (I think). I can’t figure out how to use the interface to do this, since the form for creating truly custom DNS entries doesn’t have MX records as an option, and the custom MX record form doesn’t have a way to assign them to subdomains. Has anybody figured out a way to do this? Thanks!

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