>I just got off the phone with a Sendmail dude at another ISP where a
>customer will continue hosting DNS and wants to host email with us. The
>other guy wanted our hostname for that machine.
That would work. The MX record for example.com can point to
mail.your_domain.com.
>However I reccomended just creating essentially an alias by entering a mail A
>record in his DNS that pointed to our ip address and using mail.domain.com for
>his MX record. Well then he started lecturing me on RFC's and whatnot. Saying
>that wont work and started talking about dollar signs and sendmail.
I think the word "alias" threw him off. An alias is a CNAME record, that
says "host1.example.com is really host2.example.com". You can't have an
alias in an MX record. For example, you can't have an MX record for
example.com that points to mail.example.com with no A record for
mail.example.com -- so just having a CNAME for mail.example.com pointing to
mail.your_domain.com wouldn't be OK. That's not allowed by the RFCs.
But, what you describe above is perfectly legal and quite common. It
sounds like you are talking about having the MX record for example.com
point to mail.example.com, which has an A record pointing to your mail
server. There's no problem with that.
-Scott
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