What does AI recommend for email marketing software (agencies)? Checked 2026-10-22

Claude (Anthropic) with web search claude-opus-5 asked 2026-10-22

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

The question asked, verbatim: best email marketing software for agencies. This page records one answer on one date. It is a measurement, not a ranking and not a recommendation.

Brands named, in the order the engine gave

1. Campaign Monitor mentioned
   One caveat up front: most of the "best email marketing for agencies" listicles that come back are affiliate-driven and contradict each other (one crowns Campaign Monitor, the next crowns MailerLite, usually with the same boilerplate).
2. MailerLite mentioned
   One caveat up front: most of the "best email marketing for agencies" listicles that come back are affiliate-driven and contradict each other (one crowns Campaign Monitor, the next crowns MailerLite, usually with the same boilerplate).
3. Klaviyo mentioned
   Klaviyo - if any meaningful share of your clients is ecommerce/DTC, this is the default and it isn't close.
4. ActiveCampaign mentioned
   ActiveCampaign - the pick for B2B, services, coaching, and any client where you're selling automation build-outs as the deliverable.
5. Brevo mentioned
   Brevo - best economics when you have a long tail of small clients.
6. HubSpot Marketing Hub mentioned
   HubSpot Marketing Hub - only when the client's real problem is CRM-plus-email rather than email, and the budget reflects that.
7. BigMailer mentioned
   BigMailer - the niche pick if true white-label is non-negotiable: unlimited client brands under one agency account, flat per-contact pricing, your branding throughout.
8. Omnisend mentioned
   Omnisend - a real Klaviyo alternative for smaller Shopify clients whose list size doesn't justify Klaviyo's bill yet.
9. Shopify mentioned
   Omnisend - a real Klaviyo alternative for smaller Shopify clients whose list size doesn't justify Klaviyo's bill yet.
10. Mailchimp mentioned
    Mailchimp I'd use only when a client already has it and migrating isn't worth the fight - pricing has drifted up and the agency tooling hasn't kept pace.
11. Instantly mentioned
    One scope note: if "email marketing" for you actually means cold outbound lead gen, that's a separate toolset entirely - Instantly or Smartlead - and none of the above are built for it.
12. Smartlead mentioned
    One scope note: if "email marketing" for you actually means cold outbound lead gen, that's a separate toolset entirely - Instantly or Smartlead - and none of the above are built for it.
13. Moosend mentioned
    - Moosend - email marketing software for agencies (https://moosend.com/blog/email-marketing-software-for-agencies/)

Sources the engine cited

The answer, as recorded

Searched. One caveat up front: most of the "best email marketing for agencies" listicles that come back are affiliate-driven and contradict each other (one crowns Campaign Monitor, the next crowns MailerLite, usually with the same boilerplate). So here's my actual ranking, which depends mostly on what kind of clients you serve. **First, the structural decision:** decide whether clients own their own account (you get invited as a user) or you resell under your agency's billing. Client-owned is the better default - you're not the billing intermediary, you're not holding their list, and churn doesn't hit your card. Only go white-label/reseller if marking up the software is a real revenue line for you. ### My picks, in order 1. **Klaviyo** - if any meaningful share of your clients is ecommerce/DTC, this is the default and it isn't close. Revenue-per-recipient attribution is what lets you show up to a retainer call with a number, segmentation depth is best in class, and the partner program is free with a portal for switching between client accounts. Each client keeps their own account and invites you in. ([Klaviyo partner program](https://www.nudgify.com/how-to-become-a-klaviyo-partner/), [agency multi-client access](https://community.klaviyo.com/marketing-30/agency-multi-client-access-like-shopify-apartners-14128)) 2. **ActiveCampaign** - the pick for B2B, services, coaching, and any client where you're selling automation build-outs as the deliverable. Deep behavioral automation, light CRM, SMS, 1,000+ integrations, and an agency partner program that lets you manage clients from one login. Steeper learning curve than the rest, which is fine - it's the thing you're billing for. ([comparison](https://www.g2.com/compare/activecampaign-postmark-vs-brevo-marketing-platform-vs-mailerlite)) 3. **Campaign Monitor** - the most genuinely agency-shaped account model of the mainstream tools: isolated client accounts under one master login, brand-locked templates, per-client sending domains, and client billing with your own markup. Weaker automation than ActiveCampaign, but if your job is running many brands' newsletters cleanly without them touching each other, this is built for it. ([agency guide](https://www.campaignmonitor.com/resources/guides/email-marketing-and-automation-for-agencies/)) 4. **Brevo** - best economics when you have a long tail of small clients. Pricing is send-volume based rather than contact based, so large-but-idle lists don't bleed you, and email/SMS/WhatsApp sit in one place. Builder and deliverability tooling are a step below the top three. ([Brevo reviews](https://www.capterra.com/p/132996/brevo/reviews/)) 5. **MailerLite** - the cheap, pleasant option for newsletter-and-promo clients. Excellent builder, strong support scores, low ramp time for client-side staff you'll hand the keys to. Outgrows quickly once a client wants real lifecycle automation. ([review data](https://www.g2.com/compare/activecampaign-postmark-vs-brevo-marketing-platform-vs-mailerlite)) 6. **HubSpot Marketing Hub** - only when the client's real problem is CRM-plus-email rather than email, and the budget reflects that. The Solutions Partner program is the most lucrative referral economics in this list, which is a legitimate reason to keep it in the bag. 7. **BigMailer** - the niche pick if true white-label is non-negotiable: unlimited client brands under one agency account, flat per-contact pricing, your branding throughout. Smaller company, thinner ecosystem - go here for the pricing model, not the features. ([overview](https://www.bigmailer.io/)) 8. **Omnisend** - a real Klaviyo alternative for smaller Shopify clients whose list size doesn't justify Klaviyo's bill yet. **Mailchimp** I'd use only when a client already has it and migrating isn't worth the fight - pricing has drifted up and the agency tooling hasn't kept pace. ([Mailchimp vs Klaviyo](https://www.getapp.de/compare/8268/105931/mailchimp/vs/klaviyo)) One scope note: if "email marketing" for you actually means cold outbound lead gen, that's a separate toolset entirely - **Instantly** or **Smartlead** - and none of the above are built for it. **If I had to pick two to standardize on:** Klaviyo for ecommerce clients, ActiveCampaign for everyone else. Verify current pricing on the vendors' own pages before you commit - the per-contact tiers in those listicles are frequently stale. Sources: - [Klaviyo partner program](https://www.nudgify.com/how-to-become-a-klaviyo-partner/) - [Klaviyo community - agency multi-client access](https://community.klaviyo.com/marketing-30/agency-multi-client-access-like-shopify-apartners-14128) - [Campaign Monitor - email marketing and automation for agencies](https://www.campaignmonitor.com/resources/guides/email-marketing-and-automation-for-agencies/) - [Campaign Monitor - white-label email marketing platforms](https://www.campaignmonitor.com/blog/email-marketing/white-label-email-marketing-platforms/) - [G2 - ActiveCampaign vs Brevo vs MailerLite](https://www.g2.com/compare/activecampaign-postmark-vs-brevo-marketing-platform-vs-mailerlite) - [Capterra - Brevo reviews](https://www.capterra.com/p/132996/brevo/reviews/) - [BigMailer - white-label email marketing platforms](https://www.bigmailer.io/) - [GetApp - Mailchimp vs Klaviyo](https://www.getapp.de/compare/8268/105931/mailchimp/vs/klaviyo) - [Moosend - email marketing software for agencies](https://moosend.com/blog/email-marketing-software-for-agencies/)

Recorded 2026-10-22 through Claude (Anthropic) with web search, model claude-opus-5. Permanent address: /answers/s/email-marketing-software-agencies-2026-10-22

Sources cited across the 21 recorded answers to this question

Alphabetical. A domain with a dated record links to it; the record says how often and when. Is one of these your site? Its record lists every recorded answer that cited it and carries the alert for the next citation.

academy.klaviyo.com · agencyanalytics.com · automationatlas.io · beehiiv.com · bigmailer.io · blog.mailfence.com · brevo.com · builts.ai · buyersprint.com · campaignmonitor.com · capterra.com · clonepartner.com · community.klaviyo.com · consultevo.com · costbench.com · dreamlit.ai · emailsendx.com · emailtooltester.com · emailvendorselection.com · etropo.com · g2.com · getapp.de · hackceleration.com · help.activecampaign.com · help.brevo.com · help.createsend.com · klaviyo.com · leadsie.com · maileroo.com · mailmunch.com · mailpro.com · moengage.com · moosend.com · nudgify.com · omnisend.com · optinmonster.com · realcostlabs.com · sasanova.com · selecthub.com · sender.net · sendpulse.com · tapfiliate.com · thecmo.com · thedigitalprojectmanager.com · toolquestor.com · wmtips.com · yournotify.com

Earlier recordings of this question

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Markdown edition · all recorded answers · weekly source index · 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.