MX-SINGLE
Only one mail server
What it means
Senders retry for days, so a short outage is survivable, but a single MX is still a single point of failure.
How to fix it
- 1Add a second MX with a higher preference number, at a different host or provider, if your mail platform offers one.
Re-check after the change
DNS changes can take up to the record's TTL to be seen; use Re-run on the result page to bypass our 10-minute cache.