Do I need MX records to send email?

Not always, but most domains need MX records to receive mail and to look operational to many mail systems.

What does MX priority mean?

Lower numbers are tried first. Multiple records can provide fallback delivery.

What is a null MX record?

A null MX record uses a single dot as the exchange and signals that the domain does not accept email.

MX tool

MX Lookup

Check whether a domain has mail exchange records and whether the configured mail hosts resolve.

SenderDNSReceiver

Enter a domain to run the check.

What this lookup validates

The tool reads MX records, sorts them by priority, flags null MX records, and verifies whether the listed exchange hosts resolve to A or AAAA records.

Recommended first fix

If there are no MX records, add the exact records from your mailbox provider and allow DNS propagation before retesting.