MailKite is an email provider in GoSMTP: create a free account, paste one API key into your GoSMTP settings, and every email your WordPress site sends goes out authenticated — SPF, DKIM, and DMARC configured for you. Unlimited domains, 5,000 emails/month free, no credit card.
This is the whole integration — one key, pasted once, for every plugin that sends through wp_mail().
Founding rate: 50% off every paid plan for your first 12 months. Applies automatically at signup — no coupon. First 1,000 customers, through December 31, 2026.
No SMTP hosts, no ports, no DNS guesswork. The key you copy in step 1 is the whole credential.
Sign up with your email — no credit card. Your API key is on the dashboard the moment you're in.
Add the domain your site sends from and set two DNS records; MailKite configures SPF, DKIM, and DMARC for you. Or send instantly from a free subdomain while DNS propagates.
In wp-admin, open GoSMTP → Connections, choose MailKite, paste your API key, and hit Send Test Email. That's the whole setup.
GoSMTP gives you a dropdown of providers. Here's what's different about picking this one.
Most providers in the GoSMTP list cap the free tier at one verified domain. MailKite doesn't: every site you run — client sites included — sends from its own domain on one account, one API key.
Sending is table stakes. MailKite also receives: point a domain at us and replies to your store receipts or form notifications arrive as clean JSON at any endpoint — something no other provider in the list offers.
SPF, DKIM, and DMARC configured for you, delivery events logged, and graceful overage — your order emails never hard-stop at a quota. If something breaks, you reach a person, not a ticket wall.
Agencies pay a domain tax everywhere else: one free domain per provider account, then per-domain pricing. On MailKite, domains are unlimited on every plan — including free. Add each client's domain, drop a scoped key into each site's GoSMTP settings, and watch every site's delivery from one dashboard.
Set up your agency accountYes. The free plan includes 5,000 emails a month across unlimited domains, with no credit card required. A typical WordPress site — contact forms, WooCommerce receipts, password resets — sends a few hundred emails a month, well inside the free tier.
Your email keeps flowing — MailKite never hard-stops your sends at the limit. You're notified as you approach it and can upgrade to Pro ($20/mo for 50,000 emails, 50% off your first year during beta) in one click. No surprise cutoffs, no silent suspensions.
Just the API key. GoSMTP's MailKite connection uses MailKite's send API directly — faster and more reliable than SMTP relay. If you ever need classic SMTP for another tool, the same account gives you smtp.mailkite.dev credentials too.
Yes — that's the point of unlimited domains. Add each client's domain to your account, use the same API key (or a scoped key per client) in each site's GoSMTP settings, and manage every site's deliverability from one dashboard.
Yes. GoSMTP takes over wp_mail(), so everything that sends email through WordPress — WooCommerce, Contact Form 7, WPForms, Gravity Forms, membership and booking plugins — goes out through MailKite automatically once the connection is set.
Free account, unlimited domains, key on the first screen. Paste it into GoSMTP and send the test email — about 3 minutes end to end.
GoSMTP + MailKite — free, unlimited domains, 3-minute setup.
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