What type of CERT do I need for TSL?

We have Exchange 2003 with a Barracuda SpamFirewall as the Gateway. I need to enabled SMTP/TLS and I am trying to get a signed cert for this to install on my Barracuda. My question is we send email from our server from two different domains.

joeblow@address1.com
joeblow@address2.com

What kind of cert will validate both email domains? I just worry that if I buy a cert that says mail.address1.com when someone from @address2.com sends a TLS email the cert will not match the address and that could cause some problems.

Thanks!
wgtechAsked:
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kieran_bCommented:
Certs do not validate domains, they validate servers.  If the server name of your server is mail.address1.com then that is what the cert must be - it doesn't matter what domains go through that address.
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wgtechAuthor Commented:
Thanks for the help!
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