Mailjet is a Paris-headquartered email platform (part of Sinch since 2019, the same parent as Mailgun) that runs marketing campaigns and transactional email through a single WordPress-friendly account. Its sending infrastructure sits inside the EU: Google Cloud data centers in Frankfurt and Saint-Ghislain (Belgium), covered by a standard GDPR DPA. For a WordPress site whose reader base and legal footprint are in Europe, that is a genuinely useful default.
The free tier sends 6,000 emails per month (200/day cap) with full SMTP and API access – enough headroom for most low-volume WordPress sites to run transactional and light newsletter traffic on one account without paying anything at signup.
SMTP settings
| Setting | Value |
|---|---|
| Host | in-v3.mailjet.com |
| Port | 587 (TLS, recommended) |
| Encryption | TLS |
| Authentication | Login |
| Username | Your Mailjet API key |
| Password | Your Mailjet secret key |
Alternative ports: 465 (SSL) and 25 (often blocked by hosting providers).
Generate SMTP credentials in the Mailjet dashboard under SMTP and SEND API Settings in the Senders & Domains section. These are the same API key and secret key used for Mailjet’s API – unlike Mailgun, which uses separate per-domain SMTP credentials.
Add Mailjet’s SPF and DKIM records to your domain’s DNS before sending production email. After configuring DNS, verify with swaks that messages authenticate correctly.
Pricing
Mailjet’s pricing covers both marketing and transactional email in a single volume allocation. There is no separate transactional tier.
| Plan | Price | Volume | Notes |
|---|---|---|---|
| Free | $0 | 6,000 emails/mo (200/day) | Full API/SMTP. Mailjet logo on emails. No credit card. |
| Starter | $9/mo | 8,000 emails/mo | 2,000 contacts. Basic support. Logo still present. |
| Essential | $17/mo | 15,000 emails/mo | Logo removed. Unlimited contacts. Segmentation. 500 email validations. |
| Premium | $27/mo | 15,000 emails/mo | A/B testing. Marketing automation. |
Annual billing saves 10%.
For WordPress transactional email only, the free tier’s 6,000/month is workable for small sites. The 200/day cap is the practical constraint: a WooCommerce store sending order confirmations, shipping notifications, and password resets draws from the same pool as any marketing campaigns on the account.
Free tier
The free tier is permanent. 6,000 emails/month with a 200/day cap, full SMTP and API access, and no credit card at signup. Both marketing and transactional email run through the same allowance; there is no separate transactional-only tier.
Free-tier messages carry a “sent by Mailjet” line in the footer; the Essential plan at $17/month removes it. Worth knowing when the account is going to send transactional mail from a business domain, since removing the branding is a paid-tier switch rather than a configuration option.
Other exclusions: contact list size is capped at 2,000 on Starter (not stated for Free but Starter is the next step up), email validations are on Essential and up, and marketing automation lives on Premium. Free-tier sending uses Mailjet’s shared IP pool. Log retention is documented as 30 days on paid tiers and shorter on Free.
The 200/day cap is the shape to plan around: 6,000/month averages 200/day, so the daily rate limit lines up with the monthly cap without headroom. A single busy WooCommerce day can absorb the daily allowance, and any marketing campaign run through the same account competes for the same pool.
The tier fits a WordPress site already using Mailjet for marketing, a dev or staging account testing the SMTP integration, or a small EU-based site that wants one account for both marketing and transactional and is comfortable with a Mailjet-branded footer while it stays on the free plan.
WordPress integration
Three paths:
Mailjet WordPress plugin – “
Mailjet for WordPress” connects via API. The plugin replaces wp_mail() and routes WordPress email through Mailjet’s API. It also includes contact list management and campaign features from the Mailjet dashboard – useful if you run marketing campaigns through Mailjet alongside transactional email.
WP Mail SMTP – WP Mail SMTP includes a native Mailjet integration. Select “Mailjet” as the mailer, enter the API key and secret key. This is the better choice if you want WP Mail SMTP’s email logging and fallback features without the marketing plugin overhead.
Generic SMTP – Any mailer plugin (Post SMTP, FluentSMTP, or WP Mail SMTP in “Other SMTP” mode) can connect to in-v3.mailjet.com using the credentials above. This path works when Mailjet is just the relay.
Verdict
Mailjet fits WordPress sites already running Mailjet marketing campaigns, and EU-based sites that want a single provider handling both directions of email under a European DPA. The 6,000/month free tier is enough headroom to test the SMTP integration or run a small site without immediate spend, and paid tiers ($9 Starter, $17 Essential, $27 Premium) keep the same marketing-plus-transactional shape as the account scales. The Sinch corporate context – same parent as Mailgun, separate product – matters mainly for buyers who want a stable owner; Mailjet is the marketer-facing platform in the group, Mailgun the developer-facing one.
Sites that need branding-free free-tier sending from day one can look at Brevo (300/day, no forced footer) or Resend (3,000/month permanent free, no branding). Sites where transactional is the only job and marketing is not on the roadmap will find SMTP2GO (1,000/month free, no branding) or Postmark ($15/month for 10,000 with 45-day log retention) purpose-built for that pattern.
For the broader setup that places Mailjet inside the WordPress email stack, see the WordPress email setup guide.
Pricing and tier structure verified August 2026 against mailjet.com/pricing. Data center locations verified against mailjet.com/legal/security-privacy/. SMTP settings verified against Mailjet documentation.