MailFlash
Under reviewTransactional email service for unlimited sends
SMTP relay and REST API for developers sending receipts, password resets and alerts from their own domains, with SPF, DKIM and DMARC authentication and webhook delivery events.
Built by Moon · Developer Tools · SaaS · Email · Paid
Coming soon on Launch Llama Tools
MailFlash is a Community listing on Launch Llama with 0 total upvotes, founded by Moon who joined in Nov 2026, compared against 4 alternatives.
Community listing
Listing status
0upvotes
Community score
Moon (Joined Nov 2026)
Founder
Compared against 4 alternatives
Market comparison
SMTP relay and REST API for developers sending receipts, password resets and alerts from their own domains, with SPF, DKIM and DMARC authentication and webhook delivery events.
About
You add and verify a sending domain by publishing SPF, DKIM and DMARC records in DNS, then send messages through the SMTP relay or REST API using your credentials. Delivery and activity logs and webhook events report what happened to each message. Automated inspection watches outbound streams and blocks marketing or bulk patterns, so the service is limited to one-to-one transactional mail. A dedicated IP is available on the Scale plan for senders who want their own reputation.
Competitors: Resend, mailgun
Follow MailFlash: X (Twitter) · LinkedIn
Key Features
- Send transactional email over an SMTP relay or REST API
- Authenticate each sending domain with SPF, DKIM and DMARC
- Receive delivery events through webhook endpoints
- Track delivery and activity logs for every message
- Reserve a dedicated IP to own your sender reputation
- Block bulk or marketing-style sending patterns automatically
Use Cases
- Sending order receipts, password resets and welcome emails from your product's own domain
- Delivering account alerts and sign-up confirmations through an SMTP relay or REST API
- Confirming delivery of each message in your application with webhook events
From the founder
Who it's for
“MailFlash is built for Saas founders , indie hackers and developers”
Why I built it
“Setting up emails for next.js or react applications can be a headache. Mailflash allows developers integrate email functionality without having to read complex api documentation”
Who it is for
- Side-project builders and early testers validating transactional email
- Growing SaaS apps and startups sending product email at scale
- Developers and indie builders who want predictable email costs
Pricing
15$/m
FAQ
What is transactional email?
Messages your product sends automatically to one person because of something they did: order receipts, password resets, sign-up confirmations and account alerts.
Can I send marketing emails?
No. MailFlash is strictly built and optimized for transactional email only. To safeguard inbox placement for all senders, our automated inspection engine monitors outbound streams in real time. The system automatically detects marketing or bulk patterns—such as mass recipient clustering, campaign velocity spikes, promotional content, and elevated bounce signals—and immediately blocks them before they can affect domain or IP reputation.
Why would I want a dedicated IP?
With a dedicated IP, your sending reputation belongs only to you. Other senders can't affect it, which gives you more control over how inboxes treat your mail.
How do I send emails?
Add and verify your domain, then send through the SMTP relay or the REST API using your credentials.
Alternatives
PharosTransactional email API and SMTP relay for developers.More in Developer Tools
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