1 domeniu 2 sau mai multe servere mail

An older RFC, RFC 974, indicates that when the preference numbers are the same for two servers, they have the same priority, hence those two terms are used interchangeably.

Sursa

Iar daca folosesti priority 1 la mail1.domeniu.ro tot nu va fi utilizat cat timp domeniu.ro raspunde la portul SMTP-ului.

N-ai decat sa creezi [email protected] iar mail.domeniu.ro sa aibe mx-ul in pc-ul tau.

The characteristic payload information of an MX record is the fully qualified domain name of a mail host and a preference value. The host name must map directly to one or more address record (A, or AAAA) in the DNS, and must not point to any CNAME records.[1]
When an e-mail message is sent through the Internet, the sending mail transfer agent (MTA) queries the Domain Name System for MX records of each recipient's domain name. This query returns a list of host names of mail exchange servers accepting incoming mail for that domain and their preferences. The sending agent then attempts to establish an SMTP connection.
The MX mechanism provides the ability to run multiple mail servers for a single domain, and allows administrators to specify an order in which they should be tried. This ability to run multiple mail servers proves very valuable for high-availability clusters of inexpensive mail gateways, which can then process hundreds of messages per second in aggregate to quarantine or remove spam and/or viruses.

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