Quick Verdict: Mailchimp vs Brevo
Winner
Depends on list size vs. send frequency
Mailchimp prices by contact count; Brevo prices by emails sent. For large lists with low send frequency, Brevo is dramatically cheaper. For small lists with high frequency, Mailchimp is comparable or cheaper. On pure deliverability, Mailchimp has a marginal edge in shared pool reputation.
| Factor | Mailchimp | Brevo |
|---|---|---|
| Pricing model | Contact-based | Volume-based (emails sent) |
| Cost: 50K contacts, 4x/month (200K emails) | ~$230/mo | ~$65/mo (Starter) |
| IP infrastructure | Large shared (broad user base) | Shared (transactional + marketing) |
| Dedicated IPs | ~$350/mo at 500K+/mo | Included on Business plan (~$145+/mo) |
| Avg inbox rate | ~82–90% | ~85–91% |
| Transactional email | Mandrill add-on (paid) | Core product feature |
| Auth default | DKIM via mcsv.net | DKIM via mail.brevo.com |
How Mailchimp Handles Deliverability
Infrastructure
Large shared pools across broad Mailchimp user base. Established global reputation. Free-tier sender mix creates variable pool quality.
IP Type
Shared (broad user base) + optional dedicated
Dedicated IPs
~$350/month at 500K+/month volume.
Avg Inbox Rate
82–90%
Strengths
- Established global deliverability reputation
- Extensive template library
- Strong A/B testing
- Good integrations
Common Deliverability Problems
- Free-tier pool contamination
- Expensive for large lists
- No frequency governor
- Mandrill required for transactional
What Mailchimp Shows You
- Open rate
- Click rate
- Bounce rate
- Unsubscribe rate
- Revenue
What Mailchimp Doesn't Show You
- Gmail reputation
- Gmail spam rate
- Yahoo complaint rate
- Inbox placement
- Bot clicks
- Blacklist status
How Brevo Handles Deliverability
Infrastructure
Brevo's infrastructure is built around transactional email reliability. Marketing email shares infrastructure with transactional, borrowing reputation from well-managed transactional sends. Volume-based pricing includes a dedicated IP on Business plan. Better value proposition for high-contact, low-frequency senders.
IP Type
Shared (transactional + marketing) + dedicated on Business plan
Dedicated IPs
Included on Business plan (~$145+/mo). Additional IPs available.
Avg Inbox Rate
85–91%
Strengths
- Volume pricing cheaper for large lists
- Transactional email included
- Dedicated IP on Business plan
- GDPR EU infrastructure option
- Multi-channel (SMS, WhatsApp)
Common Deliverability Problems
- Less e-commerce-specific than Klaviyo
- Marketing pool shared with transactional patterns
- Less template variety than Mailchimp
What Brevo Shows You
- Open rate
- Click rate
- Bounce rate
- Unsubscribe rate
- Transactional logs
What Brevo Doesn't Show You
- Gmail reputation
- Gmail spam rate
- Yahoo complaint rate
- Inbox placement
- Bot clicks
- Blacklist status
Authentication Setup Compared
Account → Domains → Verify Domain → CNAME records.
Settings → Senders & IP → Domains → Add DKIM TXT record → verify.
After configuring authentication with either ESP, publish a DMARC record for your sending domain using InboxEagle's DMARC Record Generator. Start with p=none to collect data without affecting delivery, then advance to p=quarantine and eventually p=reject once all your sending streams pass DMARC alignment.
What Both Mailchimp and Brevo Don't Show You
Regardless of which ESP you choose, both platforms leave the same critical deliverability data invisible. These monitoring gaps exist across virtually every ESP:
- Neither shows Gmail domain reputation
- Neither provides Yahoo Sender Hub complaint data
- Neither offers inbox placement testing
- Neither filters bot clicks
- Neither monitors blacklist status
The monitoring gap that costs revenue
Your ESP shows you "delivered" — but delivered to the inbox, spam folder, or promotions tab? Without inbox placement testing, you're measuring delivery to the server, not delivery to the reader. A 99% delivery rate can hide a 30–40% spam placement rate. InboxEagle's seed list testing answers where your email actually lands, not just whether it was accepted.
Which Should You Choose?
The Mailchimp vs. Brevo decision is primarily economic. Calculate your cost under each pricing model based on your actual list size and monthly send frequency. On deliverability, both platforms are comparable and both require the same external monitoring — Gmail reputation, Yahoo complaint rates, inbox placement testing, and bot click filtering.
Choose Mailchimp if...
You send frequently to a smaller list, already have established Mailchimp workflows, and value the template library and integrations. Mailchimp's pricing is competitive for under 5K contacts.
Choose Brevo if...
You have a large list but send 1–4x/month or less, need transactional + marketing on one platform, or are actively trying to reduce ESP cost. The savings at 50K+ contacts are substantial.
No matter which platform you choose, you'll need external monitoring for Gmail domain reputation, Yahoo complaint rate data, inbox placement testing, and bot click detection. InboxEagle provides all of these alongside Mailchimp, Brevo, and any other ESP.
Monitor Inbox Placement for Any ESP
InboxEagle adds Gmail domain reputation, Yahoo complaint monitoring, inbox placement testing, bot click detection, and DMARC reporting on top of Mailchimp, Brevo, and any other ESP you use.