If a specific alias stopped forwarding — emails are being sent to it but nothing's arriving in your inbox — check these in order.
The alias is deactivated
Go to Aliases and find the alias. Check if the toggle is off (grey). If so, toggle it back on. Forwarding resumes immediately.
The destination was removed or lost verification
Go to Destinations. If the destination that alias forwards to no longer exists, or shows as unverified, that's why forwarding stopped.
If the destination was deleted, edit the alias to assign it to a different verified destination. If it shows as unverified, re-verify it — see Verifying a destination.
The custom domain has a DNS problem
If the alias is on a custom domain, go to Domains and check the domain's health status. If the MX record is missing or the domain shows a health warning, fix the DNS records. See Domain status and health.
The email is in spam
Sometimes the issue isn't that forwarding stopped — the email forwarded fine but landed in spam at the destination. Check your spam folder before concluding forwarding is broken.
It's a temporary delay
Forwarding usually happens within seconds, but occasional delays of a few minutes are normal. If only one or two emails seem to be missing and others come through, it may just be a delivery delay.
Still not forwarding?
Check Analytics → Alias Performance to confirm whether the alias is showing zero activity. If it is, and the alias is active with a valid destination, contact support.