IPTOOL TR My IP

Email

MX Lookup: preference, host and IP

MX preference, exchange host and A/AAAA addresses.

Lists MX records by preference and resolves A/AAAA for each exchange.

Queries leave from this Linux server, not your ISP DNS. Free. Cached answers can differ for a short time.

Today 0 / 40 queries

What is in MX?

Lower preference is tried first. Equal values share load.

Field Meaning Example
Preference Priority (lower first) 10, 20
Exchange MX hostname aspmx.l.google.com
A / AAAA IPv4 / IPv6 SMTP diagnostic target

What MX Lookup does

Like MXToolbox “mx:”: resolveMx, sort, then A/AAAA per host. Mail delivery also needs working SMTP; this page is DNS-only.

No MX means the domain cannot receive mail (normal for web-only sites). For banner/PTR use Mail Server Test.

Examples

Google
aspmx.l.google.comSeveral MX with rising preference.
Single MX
mail.example.com · 10A should point at the right IP.

Reading results

Empty A often means a bad exchange or missing glue. Missing AAAA is usually a warning only. Super box mxlookup: or DNS Lookup (MX type) shows the same data; this page is email-focused.

Frequently asked questions

What is priority?

Preference: lower number first. Rising values like 10 and 20 are failover paths.

No MX?

No SMTP receive for that domain. Expected on web-only domains.

Where is SMTP test?

On the Mail Server Test page.

Prefix?

Type mxlookup:example.com in the super box.

What is null MX?

RFC 7505: MX “.” means the domain does not accept mail.

Is IPv6 required?

No. An MX with AAAA can receive from IPv6 senders.