In SIMS Digest #1600, The Count of CipherSpace responded to rashantha de silva: >[much stuff deleted] >It would be more like: > >company1.com. MX 10 mail.idealzone.net > >>and in my dns setting for idealzone.net change >> >>mail.idealzone.net. A new ip address > >Correct. > >And: > >mail.company1.com A new IP address
An "A" record for "mail.company1.com" is not necessary, unless oubound mail is sent with a return path of "[EMAIL PROTECTED]"; if it goes out with "[EMAIL PROTECTED]", the "MX" record pointing to "mail.idealzone.net" is sufficient. >or, you could set mail.company1.com as a CNAME to mail.idealzone.net >(this way if you change IPs you will only need to change the A record for >mail.idealzone.net). DON'T do this. The FQDN (fully-qualified domain name) that an MX record points to (i.e., what's on the right side of "MX") should be an "A" entry; _only_ use a CNAME if you take into account the "aliasing" that may (or may not, depending on the client and intermediate MTAs) occur -- see RFC2821 (http://www.ietf.org/rfc/rfc2821.txt). In short, using a CNAME as the Count suggested _may_ have the effect of rewriting an original "To: [EMAIL PROTECTED]" to "To: [EMAIL PROTECTED]", which is probably _not_ what you want (and even if you _did_ want it, it may or may not happen, dependent upon the _sending_ machine[s]). Michael A. Pasek Pasek Consulting, Inc. 9741 Foley Boulevard NW Coon Rapids, MN 55433-5616 (612) 597-5977 [EMAIL PROTECTED] ############################################################# This message is sent to you because you are subscribed to the mailing list <[EMAIL PROTECTED]>. To unsubscribe, E-mail to: <[EMAIL PROTECTED]> To switch to the DIGEST mode, E-mail to <[EMAIL PROTECTED]> To switch to the INDEX mode, E-mail to <[EMAIL PROTECTED]> Send administrative queries to <[EMAIL PROTECTED]>
