How To Use Allow And Deny Lists In The HubSpot Conversations Inbox

When your HubSpot Conversations inbox starts filling up with spam, phishing attempts, and irrelevant outreach, it doesn’t just become a distraction; it becomes a risk.

Your team ends up sifting through noise instead of focusing on real customer messages. That kind of clutter slows everyone down, opens the door to security vulnerabilities, and can throw off your routing logic and automation triggers.

If you’re a HubSpot admin, this can feel like a slow drip problem that turns into a flood. Misrouted conversations, delayed replies, and skewed reports all point to one thing: poor inbox filtering.

This guide shows you how to establish control using HubSpot’s allow and deny lists. 

You’ll learn what these filters do, how to apply them, where to find them, what common mistakes to avoid, and how to tell when your setup is actually working.

How to Whitelist or Block Senders in HubSpot Conversations

HubSpot’s Conversations inbox includes built-in allow and deny lists to help you decide which senders can and can’t reach your team.

You can whitelist or block specific email addresses or entire domains, applying a layer of filtration before a message enters your workflows.

These settings live in your Conversations inbox under Inbox Settings > Channels > Email. Once your shared email is connected, you gain access to filtering options that act as the first gatekeeper.

These aren’t just theoretical safeguards. Messages that don’t meet the allow-list criteria or that get flagged by the deny list are stopped before they get routed, logged, or trigger any automation.

For compliance managers or IT admins managing multiple users and shared inboxes, these lists serve as an early line of defense.

Unlike your email provider’s spam system, this is HubSpot-native protection that operates at the first point of contact with your CRM.

How It Works Under The Hood

When an email lands in a shared HubSpot inbox, the platform instantly checks it against the allow and deny lists. This determines whether the message even reaches your ecosystem.

Here’s what HubSpot looks for:

• Email addresses or domains on your allow list
• Email addresses or domains on your deny list

The actual intake process works like this:

1. An email hits your connected inbox
2. HubSpot checks the sender against both lists
3. If there’s a match on the allow list, the message is greenlit and delivered
4. If there’s a match on the deny list, it’s blocked and never appears
5. If there’s no match, then your standard routing rules take over

You can also filter out low-value messages, such as newsletters or auto-notifications.

This approach is cleaner and more direct than relying solely on spam detection, since filtering occurs before automation or CRM association kicks in.

Allow and deny filters are especially useful for making sure only genuinely helpful or safe messages pass through to agents or workflows.

Main Uses Inside HubSpot

Filtering Spam And Phishing Attempts

Deny lists are your first line of defense against spam and phishing. If your inbox keeps getting hit by low-level bot traffic or spoofed addresses, start here.

Let’s say your “Support” inbox keeps getting pinged by suspicious senders like “support-alert@fakebilling.org.” Add “@fakebilling.org” to your deny list, and HubSpot will automatically block any future attempts from that domain.

This keeps harmful content from distracting your team or triggering ticket creation from bogus emails.

Managing Vendor And Partner Communications

Allow lists shine when you need to guarantee delivery from trusted partners, systems, or vendors that send automated updates.

Imagine a SaaS platform that receives alerts from a monitoring partner via “@partnerupdates.com.” By allowing that domain, you ensure those essential messages don’t wind up in spam purgatory.

This is especially important if they trigger tickets or service updates on your end.

Protecting Internal Routing Channels

Internal teams often reach out via shared mailboxes such as “hr@company.com” or “it-support@example.com.” If you’re filtering strictly without allow lists, these requests might get blocked.

Adding your company domain (e.g., “@example.com”) to an allow list tells HubSpot that internal traffic is trustworthy.

This prevents service teams from missing time-sensitive help desk or HR requests sent through broader distribution lists.

Common Setup Errors And Wrong Assumptions

Here’s where things tend to go sideways, and how you can avoid wasting time or unintentionally blocking legit traffic.

Mistake 1: Placing The Same Domain On Both Lists

If a domain or sender is listed in both the allow and deny lists, the deny list always wins. Before saving any changes, scan both lists for overlaps.

Mistake 2: Assuming HubSpot Automatically Handles All Spam

Your email provider may catch spam before it hits HubSpot, but HubSpot’s system doesn’t replace that filtering. It supplements it. Fail to maintain both, and some messages will still slip through.

Mistake 3: Forgetting To Update Lists During Team Or Vendor Changes

If you onboard a new partner or grant a contractor inbox access but forget to update your allow list, their emails might never arrive.

Review these settings any time your team or vendor ecosystem changes.

Mistake 4: Overusing The Deny List Without Testing

Blocking entire domains might feel like a quick fix, but without testing, you risk silencing real customers.

Before you apply changes across the board, test with sample emails to confirm your list logic.

Step-By-Step Setup Or Use Guide

Before you begin, make sure you have Admin permissions and that your shared email is already connected to HubSpot.

Here’s how to get your lists in place, start to finish:

1. Go To The Conversations Inbox: Log in to HubSpot. In the top nav, choose Conversations > Inbox. Select the team inbox you want to manage, such as “Support” or “Service Desk.”
2. Open the Settings Menu: Inside the inbox view, click the gear icon. Navigate to Channels > Email.
3. Select the Right Shared Mailbox: From the list of connected mailboxes, choose the one you want to filter. The configuration panel for that mailbox will open.
4. Locate the Allow and Deny Lists: Scroll down to find the section labeled “Allow and Deny Lists” or “Email Filtering.”
5. Add Senders To The Allow List: Click “Add” under the allow list. You can enter single addresses like “client@company.com” or entire domains like “@company.com.”
6. Add Bad Actors or Domains To The Deny List: Click “Add” under the deny list. Include any senders or domains you know should not access your inbox.
7. Review For Conflicts Or Typos: Be precise. A single typo or mistakenly overlapping entry can block valid messages. Review and click Save.
8. Test Your Setup: From different accounts, send test emails using addresses from your allow and deny lists. Confirm that rejected messages stay out and approved senders get through.

Measuring Results In HubSpot

Once your filters are live, track their performance using HubSpot’s built-in analytics tools.

Here’s how to check if your configuration is doing its job:

• Conversations Report: Look for changes in the number of inbound messages. A solid deny list should trim down the total, cutting out spam by default.
• Response Time Metrics: A cleaner inbox means your team can respond faster. Monitor for a dip in average response times after the filter.
• Routing Accuracy: If automated tickets or workflows are no longer triggered by junk messages, your routing logic is working better.
• Custom Dashboards: Create dashboards showing “Conversations Created” and “Tickets Created” over time. Compare data from before and after implementing your allow/deny setup.

Checklist:

• Review filtered volume weekly for the first month
• Check for missing legitimate contacts
• Tweak lists as necessary based on support inbox trends
• Do a quarterly audit to clean out stale domains or change vendors

Short Example That Ties It Together

A SaaS company connects “support@company.com” to HubSpot Conversations. Almost immediately, their inbox floods with irrelevant third-party promo emails, many of which trigger automated ticket creation.

The admin sets up a deny list targeting known spam domains and creates an allow list that includes key partner addresses.

One week later, the inbox sees a 20% drop in total messages. Workflow interruptions stop, and agents close more tickets now that only valuable messages reach them.

Routing accuracy improves, and analytics reflect the cleaner pipeline.

How INSIDEA Helps

Setting up these filters is simple if you know where to look and what to avoid. To get it right from day one and keep it maintained, hire HubSpot experts who understand Conversations routing, inbox governance, and CRM structure.

At INSIDEA, we help you build more than just clean inboxes. We help you create reliable, secure systems that scale with your business through hands-on HubSpot consulting services.

Here’s how we support teams like yours:

• HubSpot onboarding: Set up your system with smart defaults and future-proof filtering
• HubSpot management: Keep your filters, automations, and teams aligned
• HubSpot automation support: Build logical, reliable workflows that serve real users
• CRM + reporting alignment: Monitor what matters and keep data teams on the same page

Get in touch at INSIDEA to see how we can help you build a secure, efficient HubSpot Conversations inbox that works the way your team does.

Strong inbox hygiene starts with the right gatekeepers. Set your allow and deny lists today to ensure only the right conversations make it through tomorrow.