Allow or block a sender at the mail gateway
Use the Email Business trusted and blocked lists, watch the stuck mail queue, and tell this screen apart from the similarly named one in Email Security.
Mail arriving at your CloudFly mailboxes passes through a filtering gateway. This page forces the outcome for specific senders, and shows mail that is stuck.
Before you start
- The domain is live. See Publish the four mail DNS records
- The sender address or domain you want to handle
This is not the screen with the same name in Email Security
Email Security bought on its own does not share data with this page.
| Email Business → Email Gateway (this page) | Email Security → Filter lists | |
|---|---|---|
| Protects | your mailboxes on CloudFly | your own mail server |
| You have it when | you use CloudFly mailboxes | you bought filtering for existing infrastructure |
| The lists are | separate | separate |
Using the wrong screen adds an address to a list that has no effect on the flow you are troubleshooting — check the service name in the left sidebar first.
Domains with the Email Security add-on
When an Email Business domain has the Email Security add-on, both screens use the same lists: an entry added on either one applies to both. The service administrator account no longer sees Email Gateway for that domain — edit the lists under Email Security → Filter lists instead. A mailbox that was granted admin rights keeps using Email Gateway as before.
Add to a list
Go to Email Business → Email Gateway, tab Whitelist & Blacklist filters.
The two blocks sit side by side, each with its own Add button.
| List | Mail from a sender on this list |
|---|---|
| Trusted senders (Whitelist) | always skips the spam check and goes straight to the inbox |
| Blocked senders (Blacklist) | is blocked at the gateway, before reaching your mail server |
Enter a full address, or a whole domain.
On both lists, the whitelist wins
An address on both lists is treated as whitelisted and still reaches the inbox — so blocking a sender who is already whitelisted means removing them from the whitelist first.
The whitelist skips the spam check entirely
Sender addresses are forgeable. An attacker sets the sender to a partner on your whitelist, and the message walks into the inbox unscored. A phishing message is usually just text and a link — scoring is the only layer that would have held it.
Only whitelist a real sender who has been caught repeatedly, and whitelist that exact address — not the whole domain.
Watch the queue
The Email queue tab lists mail stuck at the gateway, both inbound and outbound.
Mail in the queue was accepted but not handed over yet, and is being retried; an empty queue is the good state.
Many messages stuck at once usually share one cause — reading the reason on the first few rows is enough to spot it.
Check your work
List changes take effect immediately, unlike DNS records.
Ask that sender to send a test message:
- Added to the whitelist → the message lands in the Inbox, not the junk folder
- Added to the blacklist → the recipient sees nothing, and the sender gets a failure notice
Whitelisted but mail still goes to junk: check the real sender address is the one you added — marketing mail often sends from an address different from the one it displays.
Domain storage
Read the storage screen to see how far your allocation has gone, who is nearly full, and who is already over their limit and no longer receiving mail.
Outlook & phone
Get the right incoming and outgoing server settings, choose between IMAP and POP3, and avoid the most common sign-in mistake.