If a domain shows "missing MX records", appears inactive, or you're not receiving replies:
First confirm with mxtoolbox.com — in many cases the records are actually set correctly.
If the records genuinely aren't resolving, this is something we fix on our side. We manage your domain's DNS, so please don't add nameservers or records yourself.
If the domain is on a .online, .xyz or .site TLD, the cause may be a registry-level suspension rather than a DNS problem — see My domain shows "MANUALLY DISABLED".
A domain shows "Active" but has no MX / isn't live in DNS
A status of "Active" in the dashboard does not always mean the domain's DNS is live. Occasionally a domain is registered but was never moved onto our nameservers, so it still points to the registrar's parking nameservers (for example ns1.dyna-ns.net / ns2.dyna-ns.net) instead of ours. In that state it has no MX/SPF/DKIM/DMARC and all mail from its mailboxes fails authentication — even though the panel says "Active".
You can spot this by checking the domain's nameservers (e.g. on mxtoolbox or via a DNS lookup): if they're a parking host rather than our nameservers, the domain hasn't been delegated to us yet. This is on our side to fix — you can't change it yourself since we manage the registrar and DNS. Send support the affected domain name; we'll re-delegate it to our nameservers, and once it propagates (usually a few hours) the mailboxes will authenticate normally. Please hold off sending from those mailboxes until we confirm it's live.
Send support the affected domain names and we'll resolve it. If replies are missing specifically, also confirm your mailboxes are still connected to your sequencer / Master Inbox.