MX record lookup

Problems this finds

Your mailbox settings point to an address that doesn't exist

Senders trying to reach you can't connect to that address. Emails to you may be delayed, or, if there's no working backup, not arrive at all.

Your mailbox settings point to an address outsiders can't reach

One of your mailbox settings points to an internal network address, so senders outside your office can't deliver there. Whoever manages your mail server will need to supply the correct public address.

Some emails sent to you may not arrive

Your mailbox settings point to a shortcut name instead of the real address. Many senders follow it, but some refuse, so a few customers' emails may never reach you and you won't know.

This domain is set to not receive email

Your settings clearly tell senders this domain doesn't accept email, so they get an immediate, clean bounce. That's correct if you don't use it for email; if you do, it needs changing.

Your business can't receive email at this domain

There are no mailbox settings, so emails sent to you, like customer inquiries and replies to your quotes, bounce back. If you don't use this domain for email, you can say so instead.

Your business receives email through one server with no backup

If that server has an outage, emails to you are delayed, and lost if it lasts for days. Many providers use just one on purpose, so check your provider's instructions before changing anything.