What Claude (Anthropic) with web search answered for email marketing software (agencies) on 2026-09-15

Claude (Anthropic) with web search claude-opus-5 asked 2026-09-15

Coverage: Claude (Anthropic) with web search. Other engines not included.

The question asked, verbatim: best email marketing software for agencies

Brands named, in the order the engine gave

1. Klaviyo recommended
   Klaviyo - if any meaningful share of your clients are e-commerce.
2. Shopify recommended
   It's the default for Shopify/BigCommerce brands, and it's not close.
3. BigCommerce recommended
   It's the default for Shopify/BigCommerce brands, and it's not close.
4. ActiveCampaign recommended
   ActiveCampaign - the best all-rounder for a mixed client roster.
5. Campaign Monitor recommended
   Campaign Monitor - if white-labeling is the actual requirement.
6. HubSpot recommended
   HubSpot - for B2B clients with a sales team.
7. Brevo recommended
   Brevo (formerly Sendinblue) - the budget workhorse.
8. MailerLite recommended
   MailerLite - for small clients and lean retainers.
9. BigMailer recommended
   BigMailer or Moosend - if you're managing many accounts at low margin.
10. Moosend recommended
    BigMailer or Moosend - if you're managing many accounts at low margin.
11. Check mentioned
    - Check who owns the account.

Sources the engine cited

The answer, as recorded

## The short answer There's no single "best" - the right pick depends almost entirely on what your clients sell. But here's the order I'd actually recommend: **1. Klaviyo - if any meaningful share of your clients are e-commerce.** It's the default for Shopify/BigCommerce brands, and it's not close. Deep product-level data, revenue attribution per flow, and SMS in the same platform. The agency partner program has tiers with revenue share and a partner directory that actually sends leads. Downside: expensive as lists grow, and overkill for a B2B services client. **2. ActiveCampaign - the best all-rounder for a mixed client roster.** Strongest automation builder at a mid-market price, plus a real CRM so you can handle clients who don't have one. Their agency program gives you a partner dashboard to manage client accounts, margin on resold plans, and free accounts for your own use. This is the one I'd standardize on if I had to pick one platform for ten different clients. **3. Campaign Monitor - if white-labeling is the actual requirement.** It's the long-standing answer for agencies that want to deliver email under their own brand: branded client logins, multi-account management from one dashboard, and flexible billing so you can mark up and invoice clients yourself. Templates are genuinely nice, which matters when clients self-serve. Automation is shallower than ActiveCampaign's. **4. HubSpot - for B2B clients with a sales team.** You're not really buying email, you're buying the CRM and attribution that leadership wants to see. The Solutions Partner program is the most lucrative in the category (commission plus resale margin). Expensive and heavy; don't put a small client on it. **5. Brevo (formerly Sendinblue) - the budget workhorse.** Send-volume-based pricing instead of contact-based, which is a huge cost difference for clients with big, low-engagement lists. Sub-accounts on higher tiers. Deliverability and UI are a step below the top three, but for price-sensitive clients it's the honest recommendation. **6. MailerLite - for small clients and lean retainers.** Cheap, clean, surprisingly capable automation, and a proper agency/partner directory. Where I'd put a local business client who'd choke on Klaviyo pricing. **7. BigMailer or Moosend - if you're managing many accounts at low margin.** Both are built around per-client sub-accounts with isolated lists, billing, and white-labeled reports. BigMailer in particular is aimed at agencies and franchises juggling a lot of brands cheaply. ## What I'd actually tell you to weigh - **Isolate deliverability per client.** One client's bad list should not torch everyone else's inbox placement. Separate sub-accounts with separate sending domains (and dedicated IPs for high-volume senders) is the single most important structural decision here. - **Don't consolidate for your own convenience.** The tool that makes your reporting tidy is worth less than the tool that makes the client's revenue go up. Running Klaviyo for e-comm and ActiveCampaign for everyone else is a completely normal setup. - **Check who owns the account.** Sign clients up on their own billing where you can, with you as a user. It's better for the client relationship and it means churn doesn't leave you holding invoices. Worth noting: much of what's published as "best for agencies" listicles is affiliate-driven, including several of the sources below - I'd treat the rankings in them as leads to verify, not conclusions. Sources: - [Email Marketing Software for Agencies: 6 Top Platforms for 2026 - EmailToolTester](https://www.emailtooltester.com/en/blog/email-marketing-software-for-agencies/) - [11 Best Email Marketing Software for Agencies in 2026 - Leadsie](https://www.leadsie.com/blog/best-email-marketing-software) - [11 White-Label Email Marketing Platforms - Campaign Monitor](https://www.campaignmonitor.com/blog/email-marketing/white-label-email-marketing-platforms/) - [An Agency's Guide to Email Marketing (2026 Edition) - Campaign Monitor](https://www.campaignmonitor.com/resources/guides/email-marketing-and-automation-for-agencies/) - [9 Best White-Label Email Marketing Platforms (2026) - BigMailer](https://www.bigmailer.io/white-label-email-marketing-platforms/) - [7 Best White Label Email Marketing Software for Agencies - OptinMonster](https://optinmonster.com/white-label-email-marketing-tools/) - [16 Best Email Marketing Platforms 2026 - Email Vendor Selection](https://www.emailvendorselection.com/best-email-marketing-platforms/)

Markdown edition · the question page, with every recording · Answer Watch · AEO Watch

Answer Watch records what one AI answer engine said on one date, nothing more. Each page names the engine and the model, carries the date the question was asked, and lists the brands that appeared in the answer in the order the engine gave them, with the sources it cited. It is a measurement, not a ranking, not a recommendation and not a claim about the world. Brands that did not appear in an answer are not named on any public page. Coverage: Claude (Anthropic) with web search. Other engines not included.