IP authorisation
Up to two client servers per customer account, identified by IPv4 or IPv6 address.
SMTP Relay add-on
SMTP Relay: controlled outgoing mail from your own servers
Your applications and mail servers send outgoing mail through SecuraWall on port 587. Access is granted by IP address, checked against your SPF record and approved by an administrator. There are no SMTP passwords to leak.
Monthly per domain · No long contracts · No automatic charges
SMTP Relayacme.exampleClient serversQuota & approvalSender limits
| Server | Address | SecuraWall SPF | Status |
|---|---|---|---|
| mail.acme.example | 203.0.113.10 · IPv4 | Verified | Approved |
| app.acme.example | 2001:db8::25 · IPv6 | Verified | Waiting for approval |
Port 587 · STARTTLS offered · no SMTP passwords
Controls
Outgoing mail with the same care as incoming mail.
SPF verification
Your domain's SPF record must include SecuraWall before sending is allowed.
Administrator approval
Every relay is reviewed before it sends. Payment alone never switches it on.
Sending quotas
Limits protect your reputation if an application or account misbehaves.
Outgoing spam and data-leak checks
Outgoing messages are checked for spam and for sensitive data leaving your organisation.
Header privacy
Internal details of your network are not exposed in the headers of outgoing mail.
At a glance
The technical details of SMTP Relay.
Your servers connect on port 587. Only registered client addresses are accepted, your SPF record must include SecuraWall, and an administrator approves the relay before it sends.
| Port | 587, STARTTLS offered |
|---|---|
| Authorisation | Client IP address; no SMTP passwords |
| Client servers | Up to two per customer account |
| Sender check | Your SPF record must include SecuraWall |
| Approval | Reviewed by an administrator before sending |
| Requires | Backup MX or Email Security |
Questions about SMTP Relay
Do I need another package first?
Yes. SMTP Relay is an add-on for customers with an active Backup MX or Email Security domain.
Is STARTTLS required?
STARTTLS is offered on port 587. Authorisation is by client IP address, not by password.
How much does it cost?
USD 25 per customer account per month, covering every domain with an active package.