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I'm working on MailTrigger — a customizable SMTP server that turns any email notification into a message on platforms like LINE, Slack, Microsoft Teams, Telegram, SMS, or pretty much anything else.

The idea is simple: if your app can send an email, it can trigger notifications across multiple channels with no extra coding. Think of it as "SMTP Server to Anything."

One of the cool parts is MailTrigger supports WebAssembly (WASM), so you can customize your own notification logic and automate workflows. I’ve used it for tasks like monitoring internal systems, forwarding alerts to different chat platforms, and even adding basic decision-making logic before sending notifications. It’s been a huge time saver.

I’ve also experimented with using LLMs to assist in rule creation — you can configure notification rules using natural language instead of writing manual code. It’s like giving your infrastructure a smarter way to handle incidents.

At my company, I’m using MailTrigger for real-time price drop alerts and server health monitoring, along with integrations like Jenkins and Sentry to forward alerts to our DevOps Telegram channel.

It’s still super early, and things like the docs, pricing, and overall user experience are definitely a work in progress. But I’m iterating quickly and would love to hear feedback from this community!

Check it out here: https://mailtrigger.app/

Curious to hear your thoughts!

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testycool 5 days ago | parent | next [-]

Sounds like you are making fast progress. Congrats!

I wanted to check it out but using Brave Browser and Chrome on a Samsung A54 it took 10s+ to load. After a few seconds the spinner loaded, then the progress bar moved and then restarted and then loaded.

	▲	bear330 5 days ago \| parent [-]
		Thanks for checking it out and for the feedback — really appreciate it! I’m sorry the loading took so long. I’m not entirely sure if the issue was with the main site or the Join Waiting List process. We’ll definitely investigate and get it fixed as soon as possible. If it turns out that the waiting list form was the problem and you'd still like to join, feel free to shoot me an email at bear@nuwainfo.com — I'd be happy to add you directly! Thanks again for flagging this. Your feedback means a lot and will help us improve!

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4ndrewl 4 days ago | parent | prev [-]

How are you handling validation of inbound emails to prevent spoofing? Depending on your pricing model it could work expensive for someone?

	▲	bear330 3 days ago \| parent [-]
		Great question — thanks for bringing it up! Right now, each MailTrigger mailbox requires SMTP authentication (username/password), so unless someone has the correct credentials, they can’t inject messages. That gives us a basic layer of protection against spoofing from the SMTP side. For forwarded emails (e.g. from Gmail), we do validate SPF, DKIM, and DMARC on inbound messages. Each mailbox acts as a gated endpoint — only verified senders are allowed to trigger actions. As for pricing — you nailed it, we’re still working that out. We have a few rough ideas, but I’d genuinely love to hear what kind of pricing model would feel fair or sustainable to you. Would you lean towards usage-based (like number of messages/month), flat monthly per mailbox, or something else entirely? Have you seen pricing models you liked (or didn’t) in similar tools like Zapier or SendGrid? Your feedback’s incredibly helpful at this stage — really appreciate it!