Comparison

SecureSMTP vs Mailgun

Mailgun is a developer-loved email API with strong deliverability. What it doesn’t give you: a WordPress plugin, a form builder, or a UI a non-engineer can operate. SecureSMTP covers all three.

SecureSMTP

Platform plugin + relay

API + WordPress plugin + hosted form builder. Ships with spam filtering, delivery dashboard, and a UI your marketing team can use without a Slack ping to engineering.

Mailgun

Sinch · developer-first email API

Well-regarded email API with pay-as-you-go pricing ($1/1000 emails after Flex). Great for developers building custom mail flows; less friendly to WordPress owners.

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TL;DR

Mailgun is a pure API — engineering builds the integration. SecureSMTP wraps a similar API with a WordPress plugin, a form builder, and admin UI, so a non-technical site owner can go from install to first inbox-delivered email in five minutes.

If you’re building custom mail infrastructure, Mailgun’s API + tooling is excellent. If you’re running WordPress + a lead form, SecureSMTP saves you the wrapper code.

Feature-by-feature

Feature	SecureSMTP	Mailgun
WordPress plugin	✓ Official, one-click install	Community plugins only
Hosted form builder	✓ Included	Not offered
Free tier	✓ 5,000 emails/mo, forever	30-day trial, 5k emails
Pay-as-you-go option	No (flat monthly)	$1 per 1k emails (Flex)
SPF + DKIM + DMARC	Yes, guided setup	Yes, self-serve
Email validation API	No	Yes (add-on)
Inbound email routing	No	Yes
Contact-form spam protection	✓ AI + honeypot + rate limit	None built-in
Dashboard for non-devs	Yes	Dev-oriented UI

Pick SecureSMTP when

You run WordPress and want plugin-based setup
You need a form builder + email delivery in one product
You want a real free tier for small sites
Your team includes non-developers who need a usable dashboard

Pick Mailgun when

You’re building custom mail infrastructure in code
You need inbound email parsing / routing
You want pay-per-email pricing that scales linearly
You need email validation as a service

Pricing at a glance

Mailgun Flex is pay-as-you-go at $1 per 1,000 emails. SecureSMTP Pro is $19/mo for up to 250k emails. Below 5,000 emails/month, SecureSMTP is free forever.

FAQ

Does SecureSMTP have Mailgun’s API depth?+

We match on the core (send, log, webhook events, DKIM). We don’t match on inbound routing or email validation — those are Mailgun-specific.

What about deliverability?+

Both us and Mailgun run on IP pools with active reputation monitoring. For WordPress lead forms, deliverability is effectively identical — the winning factor is DNS setup, which our guided wizard handles in one screen.

Can I use both?+

Yes — many teams use SecureSMTP for WordPress + form emails and Mailgun for custom application email. Different domains, different accounts, no conflict.

Which is cheaper at scale?+

At 50k emails/month, we’re both around $9–$10. Above 200k emails, Mailgun’s pay-as-you-go pulls ahead; below 50k, our free/starter plans are cheaper.

Learn more

Deliverability

SPF vs DKIM vs DMARC explained

WordPress

Why wp_mail() stops working

Free tool

Run a deliverability test on your domain

Customers

See how real teams use SecureSMTP

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