Package 1 · Backup MX
Secondary MX, temporary queuing during destination outages and automatic delivery on recovery. No mailbox pre-check, AntiSpam, Antivirus, content inspection or quarantine.
TECHNICAL GUIDES
Backup MX Queue Retention and Deletion
Understand message age, expiry, paused delivery and permanent queue removal.
Package 2 · Email Protection
Primary MX gateway with configurable AntiSpam, Antivirus, sender-domain checks and quarantine. Publish only gate.securawall.com and configure a separate manual receiving target. Queuing and recovery remain included.
Optional SMTP Relay add-on
Add authorized outbound delivery to either Package 1 or 2 for the same domain. Separate add-on pricing, approval, server credentials, quotas, TLS and verified SPF apply. Customer-domain DKIM signing is optional and recommended. Incoming protection remains determined by the base package.
Explore packages and add-ons
By the SecuraWall team · Updated · Operational guidance, not a delivery guarantee.
A delivery queue is temporary
The queue stores accepted messages awaiting an SMTP delivery outcome. It is not a mailbox archive. After the destination accepts a message, it leaves the delivery queue. Historical metadata may remain for its separate retention window without retaining a downloadable copy of that message.
Pauses do not restart the clock
Missing ownership proof, service suspension or a destination problem can pause processing. Waiting during a pause still consumes queue lifetime. Check the oldest queued item and the settings actually applied to your domain, not only a generic marketing number.
Complete message size matters
A limit on the encoded SMTP message includes headers and encoding overhead. A file attachment grows when encoded, so a file matching the displayed message limit may exceed it after encoding. Storage is finite and shared; the absence of a per-message charge does not mean unlimited storage.
Deletion is permanent
Confirmed domain deletion purges its queued and held messages. A shared queued message may contain recipients in several domains; purging that message also removes it for the other pending recipients. Read the deletion confirmation and coordinate with the administrator before irreversible removal.
Metadata has separate retention
Recorded delivery and SMTP status metadata is retained for 90 days under the current operational retention policy. Collection can be delayed or incomplete. Collection can be delayed or incomplete. Do not rely on it as a legal mail archive or recoverable message backup. Preserve business records in the appropriate system.
Check dates before an outage
Review queue and subscription dates in the portal. Reminder emails themselves can be delayed or rejected. Keep an independent account email and arrange recovery of the real destination before queue expiry.
References and service conditions
Related guides
Deferred vs Bounced Email: SMTP 4xx and 5xx
Read delivery errors without confusing temporary retry, permanent rejection and inbox placement.
Read guide →How to Test Backup MX Safely
Validate your own domain, queue behavior and recovery without treating an open port as successful delivery.
Read guide →What Is Backup MX?
How a secondary MX queues incoming mail, where it helps and what it cannot replace.
Read guide →