Posthaste
Transactional email API that runs its own mail servers
Details
- External ID
- 1254838
- Source
- PH
- Company
- —
- Product
- Posthaste
- Website domain
- producthunt.com
- Launched
- Sept. 21, 2026
- Cohort
- —
- Upvotes
- 2
- Upvotes percentile
- 0.7405388069275176
- Tags
- Email, API, Developer Tools
- Fetched at
- Sept. 21, 2026, 5:01 p.m.
- Updated at
- Sept. 21, 2026, 5:01 p.m.
Description
Posthaste is a transactional email API that isn't a layer over Amazon SES. We run our own mail servers, deliver straight to the recipient's server and keep its exact SMTP reply on a tamper-evident, hash-chained record. Free for 750 emails a month.
Enrichment
- Theme
- email infrastructure and inbox utilities
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- transactional email api with self-hosted mail infrastructure
- Manually corrected
- False
Could you build this?
No Operating independent mail transfer agents (MTAs), building a verifiable cryptographic hash-chained audit log, and maintaining high deliverability reputation against major mailbox providers requires deep email infrastructure and systems engineering.
What it would actually take: A production implementation requires deploying custom or heavily tuned MTAs (like Postfix or Haraka) on bare metal/dedicated IPs, managing rDNS, SPF, DKIM, DMARC, and feedback loops. It needs a resilient distributed queue (Kafka/Redis) handling SMTP retry backoffs and raw socket transcripts, plus a cryptographic ledger structure for the hash-chained logs. The hardest part is IP warming and email deliverability engineering to avoid getting blocked by Google and Microsoft spam filters.
Competitors
Other products that read as similar to this one — 62 launches clear the similarity bar, closest 8 shown.
Attention rank: #16 of 63 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 286 days after the earliest competitor.
- MailCraft · ph · 2026-09-26 · 2 upvotes · similarity 0.51
- Sendhit · ph · 2026-09-19 · 2 upvotes · similarity 0.48
- opensend · github · 2026-09-09 · 119 upvotes · similarity 0.45
- elasticemail-examples · github · 2026-09-22 · 22 upvotes · similarity 0.43
- Anypost · hn · 2026-07-21 · 25 upvotes · similarity 0.43
- Mailyte · ph · 2026-09-15 · 75 upvotes · similarity 0.43
- Posthorn, self-hosted mail gateway · hn · 2026-05-27 · 83 upvotes · similarity 0.42
- eusend · ph · 2026-09-27 · 2 upvotes · similarity 0.38
Other launches for this product
Same idea, different domain
Nobody's really built a dev tools tool for Sales yet.