What is an MX record?

An MX record identifies servers that receive mail for a domain. Delivery normally tries the server with the lowest numeric preference first.

Reading the result

In DNS Lookup, enter only the recipient address's domain after @. Select MX, complete verification, and search; do not enter the full email address.

NetKarte separates preference, exchange, and TTL. Multiple MX records can provide redundancy.

Limitations

An MX record alone does not guarantee successful delivery or anti-spam protection. Its exchange also needs address records.

Keep preference and destination together

Illustratively, 10 mx1.example.com is preferred over 20 mx2.example.com. Ten is not a speed or score, and NetKarte's record number is not the preference. Read Priority, Exchange, and TTL within each block.

For delivery problems, query the recipient domain, compare exchange names with configuration, then check their A/AAAA. Share the actual bounce with the mail administrator. NetKarte does not test SMTP connections or mailbox existence. MX alone also cannot determine SPF, DKIM, or DMARC success.