Monitor your MX records for unexpected changes
Your MX record decides where inbound email for your domain goes. When it changes unexpectedly, mail can silently stop arriving with no error visible to your website or app.
A dropped or changed MX record breaks email silently
A migration to a new mail provider, a mistake in your DNS provider's dashboard, an expired configuration, or a compromised registrar account can all change or remove an MX record. Because nothing "goes down" in the way a website outage does, this usually isn't noticed until customers report missing emails or senders start getting bounce messages.
MXexample.com10 mail.example.com→10 mail.wrong-provider.net
A single changed MX record can redirect or drop all inbound mail for a domain.
How OneDollarDNS catches this
OneDollarDNS queries your domain's authoritative nameservers directly and compares the result against the last snapshot. By default, each domain is checked every hour; the Frequent Monitoring add-on lets you mark specific hosts — including the ones handling mail — as Priority for 5-minute checks instead. When an MX record changes, you get an alert on the next check with the exact old and new value. See how monitoring works for the full mechanics.
What this doesn't do
OneDollarDNS tells you when the MX record's value changes — it doesn't verify that the mail server behind it is actually accepting connections or that messages are being delivered. That's a job for uptime or mail-delivery monitoring. See how DNS monitoring compares to uptime monitoring.
New to MX records? Read how email routing works for background on how MX records direct mail.