HubSpot Sales Extension vs BCC Logging: Which is Better for Outlook?

If you use HubSpot CRM and Microsoft Outlook together, you have two main ways to get your emails logged into HubSpot. The first is the HubSpot Sales Extension for Outlook — an official add-in from HubSpot that adds a sidebar to your Outlook window. The second is BCC email logging — where a unique HubSpot email address is included in the BCC field of every outgoing email.

Both methods work, but they work very differently in practice. Understanding the real-world trade-offs between them is important before committing your team to one approach. This article gives you a thorough, honest comparison so you can make the right choice for your organisation.

How the HubSpot Sales Extension Works

The HubSpot Sales Extension for Outlook (sometimes called the HubSpot for Outlook add-in) is available in two variants: a legacy COM add-in for classic Outlook desktop on Windows, and a newer Office Add-in that works in Outlook desktop, Outlook on the web, and new Outlook for Windows.

After installation, a HubSpot sidebar appears inside Outlook. When you compose a new email or reply to an existing one, you can see the HubSpot details for that contact directly in Outlook without opening a browser. The extension also adds a "Log email" toggle or checkbox to the compose window. When you activate this before hitting send, the email is sent to HubSpot's servers via their API and logged to the relevant contact record.

The extension also enables email open and click tracking, allowing you to see whether a prospect opened your email or clicked a link — a useful feature for prioritising follow-ups.

How BCC Email Logging Works

BCC logging is a fundamentally different approach. Each HubSpot user has a unique email logging address — a special inbox that HubSpot controls. When you include this address in the BCC field of any outgoing email, HubSpot receives a copy and processes it as a CRM activity, matching it to the appropriate contact by recipient email address.

Because this method uses standard email protocol rather than a proprietary API or add-in, it is technically simpler, more robust, and less dependent on any specific software environment. There is no sidebar, no toggle, no active opt-in required for each email. The logging either happens (because the BCC address is present) or it does not.

The limitation with manual BCC is that it requires a human to remember to add the address every time. This is where BCC Logger comes in: it automates the BCC insertion so that the address is added to every outgoing email without any action from the user.

Head-to-Head Comparison

The Case for the HubSpot Sales Extension

To give it a fair hearing: the HubSpot Sales Extension has genuine strengths that BCC logging does not replicate. The CRM sidebar is legitimately useful — being able to see a contact's deal history, last interaction, and properties without opening a browser window saves time and reduces context-switching during a busy day of emailing.

Email open and click tracking is also a meaningful capability for sales reps who want to know whether a prospect has engaged with their message before following up. This tracking is tied to the extension's logging mechanism and is not available through BCC logging alone.

For teams that are disciplined about using the extension, have IT policies that permit it, and primarily work in a single consistent Outlook environment (such as Outlook desktop on Windows only), the extension can be a reasonable choice — particularly if the sidebar features add daily value.

Why BCC Logging Wins on Reliability

Despite the extension's feature advantages, the core job of an email logging solution is to log emails — and on that fundamental measure, BCC logging is the winner, particularly when combined with BCC Logger's automation.

The Sales Extension fails silently. If a rep forgets to tick the log checkbox, the email is not logged. If the add-in is auto-disabled by Outlook's crash protection, the rep has no indication that their emails stopped being logged. If a team member uses Outlook on their phone for travel or out-of-office email, those messages are invisible to HubSpot entirely.

BCC logging with BCC Logger, by contrast, is unconditional. The BCC address is inserted automatically before every email is sent, regardless of which Outlook client is being used, regardless of whether the rep is having a hectic day, regardless of whether the add-in is feeling cooperative. It does one job with complete consistency.

Our Recommendation: Lead with BCC Logging

For the vast majority of HubSpot teams using Outlook, BCC logging automated with BCC Logger should be the primary email logging method. The reliability advantage is decisive. A CRM with 95% email coverage is dramatically more useful than one with 60% coverage from a well-intentioned but inconsistent opt-in tool.

If your team values the CRM sidebar and open tracking features of the Sales Extension, there is no reason you cannot run both in parallel. BCC Logger handles reliable logging automatically; the Sales Extension provides the sidebar and tracking features for reps who want them. The two approaches do not conflict — a logged email via BCC and a logged email via the extension are simply two paths to the same CRM activity.

But if you are choosing a single method to rely on for complete, accurate email history in HubSpot, BCC logging automated with BCC Logger is the right choice. It is simpler to deploy, works across every Outlook environment your team might use, and gives you a CRM that actually reflects reality — not a CRM that reflects reality on days when everyone remembers to click a checkbox.