I have two domains, one forwarded to the other. I want to use 2 e-mail accounts on both domains as aliased but some e-mails only on the other domain. I will create 2 MX records for both domains with different priorities.
I wonder that if a mailserver checks domain MX and couldn't find the e-mail account on MX 10 priority server, will it skip to check MX 80 priority server or return "mailbox couldn't find" error?
My MX scenario is as below:
firstdomain.com MX 10 (with only 2 mailbox) seconddomain.com MX 80 (with 2 mailbox and other mailboxes)
I hope I could explaing it clear. Thank you!
Update for theCleaner =================================
The story is: domainA.com: New domain domainB.com: Older domain
My client has an old domain domainB.com and redirected it to domainA.com after purchasing domainA.com. He has many email accounts on domainB.com. Also his [email protected] mailbox is active and known by his clients. He wants to buy Exchange mailbox from me. He wants [email protected] on Exchange server but also wants [email protected] as an Accepted-Domain on Exchange. He will use only [email protected] and [email protected] on Exchange server. His employees will continue to use emails on domainB.com
IN MX 10 mail.domain.com
IN MX 40 backup.domain.com
the priorities are only recommendations, nothing says you can't send to the second priority, and obviously, they mail servers do not have to have the same domain name as the domain they are the mailserver for (but it isn't a bad idea).