Most advertisers already run a search campaign and an email marketing program side by side, but few realize a third option sits between them: paid ad units, powered by a search engine’s own ad platform, that show up directly inside a Gmail or Outlook inbox. They’re easy to miss because they don’t look like search ads and they don’t compete with an email marketing tool. They’re a placement, not a channel, and that distinction is exactly why most accounts leave the opportunity on the table.

What counts as a paid search email placement

Defined broadly, a paid search email placement is any ad unit inside an email environment that’s powered by a search engine’s ad platform — Google Ads or Microsoft Advertising — rather than by an email service provider. In practice these placements come from three sources: Google’s Demand Gen, Microsoft’s Audience Ads, and Performance Max on either platform.

These units started out purely audience- and behavior-targeted. With Performance Max search themes and the return of keyword-based content targeting, they now lean closer to search-term-style targeting than they used to. Given how many advertisers already run an email marketing program, this is one of the more under-publicized ways to extend that existing investment rather than replace it.

Does it actually work?

Because placement can’t be controlled inside Performance Max, the more useful comparison is Demand Gen and Audience Ads, where placement-level control is possible. Tested directly, the short answer is yes — email placements produce results. The longer answer depends heavily on audience, vertical, and which metric you’re comparing against.

• Remarketing lists and existing customer lists consistently outperform cold prospecting audiences that lack prior engagement, which lines up with broader guidance on building remarketing lists that actually boost PPC performance.
• Performance varies by vertical: remarketing worked well in e-commerce, while prospecting performed comparatively well in insurance. The pattern isn’t universal — it has to be evaluated by audience and vertical together.
• Comparing this format against impression volume from display, or against the conversion rate of search, sets it up to look weak by definition. The fair comparison is against other awareness-adjacent placements — cost per lead, cost per acquisition, and conversion rate versus display and social — and ideally against the equivalent placements running inside Performance Max.

Email remains one of the highest-intent environments a consumer spends time in online, which is part of why the format performs better than its low profile would suggest.

Setting expectations for performance

The reason to run this format at all — like most awareness-adjacent media — is that direct-to-site traffic alone isn’t enough to sustain most businesses. Email placements add traffic that arrives either directly through the ad or indirectly through other channels afterward, which makes the resulting performance incremental by nature. Incremental activity is inherently less efficient than a channel like search, but it captures demand you wouldn’t otherwise have reached, and it sits somewhere between direct-response and pure awareness rather than belonging cleanly to either bucket.

That distinction matters when comparing formats head to head. Testing the old Google Display Network against Demand Gen display, using the same audience targets and similar spend levels, produced meaningfully different performance — a reminder that historical display benchmarks don’t automatically transfer to newer placement types, a shift covered in more detail in Google retiring standalone Display campaigns in favor of Demand Gen.

Structuring campaigns for email placements

Search platforms generally recommend lumping every placement type — video, display, email — into a single campaign or ad group, on the logic that more data produces better optimization. That can work, but it also removes the ability to isolate performance or prevent cannibalization between formats.

Separating video and display into distinct campaigns, or at minimum distinct ad groups, gives more control over where budget goes and reduces the risk of one placement type crowding out another — the same trade-off explored in whether Performance Max actually beats running separate campaigns. Email placements in particular often post the highest click-through rate and time-on-site of any placement in the mix, which is a strong argument for deliberately protecting volume for them rather than letting the algorithm decide.

Running Performance Max alone will pick up some Gmail and Outlook inventory automatically, but with far less control over how much. As soon as Performance Max starts seeing stronger results from Shopping or Search, it reallocates away from email inventory — the same pattern that happens with any underperforming placement inside Performance Max. Testing showed a Google Performance Max campaign’s Gmail rotation shrinking substantially between the first and sixth month as budget shifted toward search-driven leads. The same effect showed up in Bing Performance Max, where the Outlook placement dropped from 1.6% of impressions in month one to 0.5% by month six. Email placements inside Performance Max won’t outperform search, but running Demand Gen and Audience Ads concurrently — rather than relying on Performance Max alone — keeps that inventory available deliberately instead of losing it to reallocation. For advertisers who want more say over how Performance Max allocates spend generally, that’s the same instinct behind taking back control of Performance Max rather than leaving every decision to automation.

Practical setup details

Google’s Demand Gen is currently the only major Google ad unit that still supports in-platform lookalike audiences, which makes it a strong prospecting tool for this placement type — alongside newer measurement additions like view-through conversion optimization in Demand Gen, which helps credit the indirect traffic these placements tend to generate. Microsoft’s Audience Ads never removed the equivalent feature — its auto-generated version is called “Similar” audiences.

Headline truncation is a real constraint in email environments. Headlines have a 40-character limit, but keeping copy to 30 characters or fewer meaningfully reduces the risk of truncation, especially since some environments show the full headline and others show none at all. Getting a clear, attention-grabbing headline fully visible matters more here than in most placements, since the recipient only sees it in a crowded inbox before deciding whether to open the message.

For advertisers testing this for the first time, platform guidance typically recommends at least $100 a day across all Demand Gen unit types in a single campaign. A more contained test — isolating a campaign to just Gmail and Outlook placements — can run on a smaller daily budget and still produce a usable read, provided the creative and audience size are strong enough to support it.

Where this fits, and where it doesn’t

This format is not a substitute for an email marketing program. It’s a way to add incremental reach and augment an existing email strategy, not replace the direct-response efficiency of either search or true email marketing. Expect a real, if modest, last-click contribution rather than search-level efficiency, delivered inside one of the few advertising environments people spend real time in without landing in a spam or junk folder.

Frequently asked questions

What is a paid search email placement?

It’s an ad unit that appears inside an email inbox — typically Gmail or Outlook — powered by a search engine’s ad platform (Google Ads or Microsoft Advertising) rather than an email service provider. These placements come from Demand Gen, Audience Ads, and Performance Max.

Should I use Performance Max or Demand Gen for email placements?

Performance Max will pick up some Gmail and Outlook inventory automatically, but placement-level control isn’t available, and the algorithm tends to reallocate budget away from email placements once it sees stronger results from Search or Shopping. Running Demand Gen or Audience Ads separately gives more direct control over how much volume goes to email inventory.

Do email ad placements perform as well as search or dedicated email marketing?

Not at the same efficiency, and they aren’t meant to. This is an incremental, awareness-adjacent format that adds reach beyond what direct-to-site search and email marketing already capture — worth comparing against display and social metrics like cost per lead and cost per acquisition rather than against search conversion rates.

How should I structure campaigns to protect email placement volume?

Separating video and display into their own campaigns or ad groups, rather than lumping every placement type together, reduces cannibalization and lets you dedicate deliberate budget to email placements, which often produce a comparatively high click-through rate and time on site.