SMTP250
Signed PDF records of recipient mail server acceptance
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This is 1 of 39 launches in transactional email platforms — see how it stacks up on momentum and crowding →
206 other launches read as similar to this one →
Details
- External ID
- 1278282
- Source
- PH
- Company
- —
- Product
- SMTP250
- Website domain
- producthunt.com
- Launched
- Oct. 13, 2026
- Cohort
- —
- Upvotes
- 1
- Upvotes percentile
- 0.33
- Tags
- Email, Productivity, Developer Tools
Description
SMTP250, a product of ADHOCON GmbH, forwards email and returns a signed PDF documenting recipient server acceptance. €1 incl. VAT: reserve first, capture after SMTP 250 OK. Free DEMO without forwarding. No app, account or subscription. Not proof of reading or inbox placement. Operator details: smtp250.org/legal.html
Enrichment
- Niche
- transactional email platforms
- Vertical
- Horizontal
- Function
- Compliance & governance
- Audience
- B2B
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- cryptographically signed proof of email delivery for senders
- Manually corrected
- False
Could you build this?
Partial While generating signed PDFs is straightforward, running an authenticated transactional MTA that captures raw SMTP 250 OK handshake receipts and provides legally defensible audit logs requires deep email infrastructure expertise.
What it would actually take: The core challenge is operating a custom SMTP forwarding relay (e.g., via Postfix or a custom Go/Rust SMTP server) that tracks and cryptographically logs downstream SMTP dialog handshakes (specifically receiving the 250 response). The system needs an automated PDF generation service paired with an X.509/PAdES digital signature certificate (PKI infrastructure) and resilient IP reputation management to avoid recipient spam rejection.
Competitors
Other products that read as similar to this one — 206 launches clear the similarity bar, closest 8 shown.
Attention rank: #80 of 207 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 283 days after the earliest competitor.
- Ive Sent It · hn · 2026-09-23 · 18 upvotes · similarity 0.48
- MailOnce · ph · 2026-09-15 · 1 upvotes · similarity 0.45
- Email Verify · ph · 2026-10-01 · 2 upvotes · similarity 0.44
- Mailbind · ph · 2026-10-06 · 2 upvotes · similarity 0.44
- DashSign · ph · 2026-10-07 · 1 upvotes · similarity 0.44
- receivemail.dev · ph · 2026-10-03 · 1 upvotes · similarity 0.42
- Quote and Sign · ph · 2026-09-11 · 1 upvotes · similarity 0.42
- Sign PDF Online · ph · 2026-09-15 · 1 upvotes · similarity 0.42
Other launches for this product
- No other launches for this product.