Transactional email
SendGrid vs Mailgun
SendGrid suits teams that also want marketing campaign tools alongside transactional sending. Mailgun suits developers who want a lean API, strong email validation and flexible routing without the marketing layer.
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SendGrid or Mailgun — which should you use?
SendGrid suits teams that also want marketing campaign tools alongside transactional sending. Mailgun suits developers who want a lean API, strong email validation and flexible routing without the marketing layer. SendGrid starts at Paid plans from roughly $20/month (free tier: Free tier for a limited number of emails per day.); Mailgun starts at Paid plans from roughly $15–35/month depending on volume (free tier: Free trial allowance rather than a permanent free tier.). Prices are list prices and change, so check the vendor pages before buying.
Last updated 3 August 2026
Both are established transactional email APIs used for receipts, password resets and app notifications. SendGrid, owned by Twilio, has grown a marketing campaigns product alongside its API. Mailgun has stayed closer to its developer roots, with tools like email validation and inbound routing built in.
The decision usually comes down to what else you need from the account: a marketing UI on top of the API, or a purely developer-facing tool with strong deliverability tooling.
Side by side
SendGrid and Mailgun in short.
SendGrid
Transactional and marketing email API owned by Twilio, with a campaign UI included.
- Free
- Free tier for a limited number of emails per day.
- Paid from
- Paid plans from roughly $20/month
Good at
- Marketing campaigns UI sits alongside the transactional API in one account
- Backed by Twilio's broader communications platform and SDKs
- Solid deliverability tooling and dedicated IP options
Weak at
- Support has a mixed reputation compared to smaller specialists
- Pricing structure has changed repeatedly, worth double-checking current tiers
Mailgun
Developer-focused transactional email API with validation and inbound routing.
- Free
- Free trial allowance rather than a permanent free tier.
- Paid from
- Paid plans from roughly $15–35/month depending on volume
Good at
- Email validation API is a genuinely useful built-in add-on
- Inbound email routing and parsing are strong for building app features
- API and docs stay narrowly focused on developer needs
Weak at
- No serious marketing campaign tools if you need them later
- Dashboard is more utilitarian than SendGrid's
The differences
Where they actually diverge.
| Feature | SendGrid | Mailgun |
|---|---|---|
| Free tier | Yes, limited daily sends | Trial only |
| Marketing campaign UI | Included | Not offered |
| Email validation | Add-on | Built-in API |
| Inbound routing | Available | Strong feature |
| Entry price | ~$20/month | ~$15–35/month |
| Parent company | Twilio | Sinch |
| Deliverability tooling | Good | Good |
| Best for | Teams wanting API plus marketing UI | Pure developer use cases |
Pick one
Which one fits you.
Choose SendGrid if
- You want transactional sending and a marketing campaign tool in one account
- You're already using other Twilio products
- You need dedicated IP options at scale
Choose Mailgun if
- You want a lean API with no marketing layer to pay for
- Email validation and inbound parsing matter to your app
- You prefer a narrowly developer-focused tool
When neither is the answer
For a small side project, Resend's free tier and React Email templates are a faster way to get transactional email working.
Questions
Common questions.
Do I need dedicated IPs?
Only at meaningful volume, usually tens of thousands of emails a day. Below that, shared IPs with good sending practices work fine on either platform.
Which has better documentation?
Both are solid for a developer audience. Mailgun's docs stay more tightly scoped to the API; SendGrid's cover a broader product surface.
Can I use either for marketing newsletters?
SendGrid, yes, through its Marketing Campaigns product. Mailgun is not built for that and you'd want a dedicated email marketing tool instead.
Is Mailgun's validation API worth it?
For signup forms with a lot of typos and disposable addresses, yes — it catches bad addresses before they hurt your sender reputation.
How hard is switching providers?
Switching the sending API is usually a small code change if you're using SMTP or a standard library. DNS records for domain authentication need updating either way.
Prices are list prices published by each vendor and change often — check the linked pricing pages before you buy. We take no affiliate commission and nobody pays to appear here.
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