so, kurzer auszug aus dem handbuch
du hast den fehler beim MX eintrag
6.3.2. Discussion of MX Records
As described above, domain servers store information as a series of resource records, each of which contains a particular piece of information about a given domain name (which is usually, but not always, a host). The simplest way to think of a RR is as a typed pair of data, a domain name matched with a relevant datum, and stored with some additional type information to help systems determine when the RR is relevant.
MX records are used to control delivery of email. The data specified in the record is a priority and a domain name. The priority controls the order in which email delivery is attempted, with the lowest number first. If two priorities are the same, a server is chosen randomly. If no servers at a given priority are responding, the mail transport agent will fall back to the next largest priority. Priority numbers do not have any absolute meaning — they are relevant only respective to other MX records for that domain name. The domain name given is the machine to which the mail will be delivered. It must have an associated A record — CNAME is not sufficient.
For a given domain, if there is both a CNAME record and an MX record, the MX record is in error, and will be ignored. Instead, the mail will be delivered to the server specified in the MX record pointed to by the CNAME.
Code:
example.com. IN MX 10 mail.example.com.
IN MX 10 mail2.example.com.
IN MX 20 mail.backup.org.
mail.example.com. IN A 10.0.0.1
mail2.example.com. IN A 10.0.0.2
For example:
Mail delivery will be attempted to mail.example.com and mail2.example.com (in any order), and if neither of those succeed, delivery to mail.backup.org will be attempted.
also füge in der zeile
IN MX computer2
irgendeine zahl hinzu, und es sollte kein problem mehr geben
sollte dann so ausschauen:
IN MX
10 computer2