Precise control over exactly who can reach your team.
Spam filters make decisions based on probability. Allow and block lists make decisions based on certainty. IP Four manages organisation-wide, department-level, and per-user lists so critical senders always get through and known bad actors never do.
Every level of list control your organisation requires.
From organisation-wide policies to individual user preferences, allow and block list management gives you certainty that the right email always gets through.
Organisation-Wide Allow Lists
Trusted senders and domains added to organisation-wide allow lists that bypass spam filtering. Critical business partners, payment processors, and regulatory bodies guaranteed delivery regardless of content scoring.
Organisation-Wide Block Lists
Known bad actors, persistent spam sources, and unwanted senders blocked at the organisation level. Block list entries applied instantly across all users with no individual action required.
Per-User Allow and Block Lists
Individual users maintain personal allow and block lists through a self-service portal. Personal preferences respected within organisation-wide policy boundaries. No IT involvement required for routine management.
Department-Level List Management
Department-specific allow and block lists for teams with unique sender requirements. Finance teams can whitelist payment processors, legal teams can whitelist court systems, without affecting other departments.
List Synchronisation and Audit
Allow and block lists synchronised across all filtering layers. Full audit trail of list changes with timestamps and responsible user. Regular list reviews to remove stale entries and maintain accuracy.
List Effectiveness Reporting
Dashboards showing allow list bypass volumes, block list hit rates, and list growth trends. Identify which allow list entries are most used and which block list entries are catching the most traffic.
From list audit to precise sender control.
Current List Audit
We review your existing allow and block lists, identifying stale entries, missing critical senders, and gaps in coverage. Establish a clean baseline before deploying new list management controls.
Critical Sender Identification
Work with your team to identify all business-critical senders that must be allow-listed. Payment processors, regulatory bodies, key clients, and business partners mapped and documented.
Organisation List Configuration
Organisation-wide allow and block lists configured and populated with identified critical senders and known bad actors. Lists applied across all filtering layers simultaneously.
Department and User List Setup
Department-level lists configured for teams with specific requirements. Self-service portal access provisioned for individual user list management within defined policy boundaries.
Audit Trail Activation
Full audit trail enabled for all list changes. Reporting configured to show list activity, bypass volumes, and block hit rates. Alerts set for unusual list modification activity.
Ongoing List Maintenance
Quarterly list reviews to remove stale entries and add new critical senders. Support for urgent allow and block list requests. Monthly reporting on list effectiveness and coverage.
How we have helped UK businesses control their sender lists.
Critical Supplier Emails Being Blocked
A Birmingham manufacturing firm had emails from their primary component supplier being incorrectly flagged as spam. Production delays were occurring because purchase order confirmations were not being received.
Supplier domain added to organisation-wide allow list. Delivery guaranteed regardless of content scoring. Production delays eliminated. Allow list review identified 12 other critical suppliers needing similar treatment.
Persistent Spam from Known Sources
A London professional services firm was receiving persistent spam from a set of known domains that were evading content filters by regularly changing message content. The same domains kept appearing.
Persistent spam domains added to organisation-wide block list. Spam from those sources blocked at connection. Block list expanded as new domains from the same campaign were identified. Spam volume reduced by 40%.
Finance Team Needing Payment Processor Whitelisting
A Cardiff retail business had their finance team missing payment processor notifications because the automated emails were being caught by spam filters. Reconciliation was being delayed as a result.
Payment processor domains added to finance department allow list. Notifications delivered reliably. Reconciliation delays eliminated. Department-level list approach avoided affecting other teams.
Take precise control of who can reach your team.
Our free list management review audits your current allow and block lists, identifies missing critical senders, and shows you how a structured list management approach would eliminate false positives and improve delivery reliability.