Record the domain's current MX records, actual mailbox server and every valid recipient or alias. Confirm which team administers the filter and which administers the mailboxes. The filtering service does not automatically replace your mailbox hosting or create missing users.

1. Open the incoming-filter service supplied with your order and add or select the correct domain. Confirm that the service is active.
2. Configure the delivery destination using the actual mail-server address required by the filtering service. Avoid pointing delivery back to the domain's new filtering MX records, which can create a loop.
3. Set up recipient verification or the supported recipient list. Test a valid mailbox and an invalid address so legitimate recipients are recognised and unwanted addresses are handled correctly.
4. Review any required firewall or mail-server acceptance settings with your mail administrator. Restrict exceptions to the provider's current, verified delivery infrastructure rather than opening unrestricted relay access.
5. Publish the exact MX records provided for the filter at the authoritative DNS provider. Keep a record of the previous settings for a controlled rollback.
6. Send test messages from unrelated external accounts. Confirm that the filtering log shows acceptance and onward delivery, and that the final mailbox receives the message.

Configure quarantine access and reports for the appropriate users. Teach staff to review sender details and message content before releasing suspicious mail. Broad allowlisting of an entire public email domain can undermine the protection you purchased.

Follow one message through the route using its sender, recipient and timestamp. If it never reaches the filter, review MX records. If the filter accepts it but cannot deliver, check the destination, recipient validation and mail-server restrictions. If it is quarantined, inspect the reason before changing a rule.

Some services queue mail during a destination outage, but queue duration and recovery behaviour are service-specific. Check the dashboard and contact support promptly. Do not assume that queued messages are retained indefinitely or that a successful MX change proves the destination is reachable.

• Configuring outgoing filtering and investigating blocked messages
• Planning email archiving, retention and authorised searches
• Troubleshooting email delivery, spam placement and authentication records
• Moving business email without losing track of messages

• SpamExperts email services
• Gmail Senders