Posthorn
Ranked 5 of 5 email APIs by recommenders
Lets self-hosted apps send mail through a local relay to your transactional mail provider, with no mail server to run; one critic flags the risk of exposed mail services.
Lets self-hosted apps send mail through a local relay to your transactional mail provider, with no mail server to run; one critic flags the risk of exposed mail services.
6 people gave an opinion
- recommend it
- 5
- criticize it
- 1
- approval share
- 83%
Recommended in 1 of 13 months
- November 2025: not recommended
- December 2025: not recommended
- January 2026: not recommended
- February 2026: not recommended
- March 2026: not recommended
- April 2026: not recommended
- May 2026: recommended
- June 2026: not recommended
- July 2026: not recommended
- August 2026: not recommended
- September 2026: not recommended
- October 2026: not recommended
- November 2026: not recommended (month in progress)
Why it doesn’t carry the badge
- 5 people recommend itNeeds 10 or more, not met.
- 5 recommenders for every criticNeeds 2 to 1 or better, met.
- Recommended in 1 of 13 monthsNeeds 4 or more, not met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Solves a real self-hosting mail gap
“for gluing together a bunch of different apps you're self hosting, I think this makes sense and addresses a real issue”
Comment from 27 May 2026 in “Show HN: Posthorn, self-hosted mail without the mail server” “This solves an issue that I really do have.”
Comment from 28 May 2026 in “Show HN: Posthorn, self-hosted mail without the mail server” “that's the gap I built Posthorn to fill”
Comment from 28 May 2026 in “Show HN: Posthorn, self-hosted mail without the mail server” Good mix of features
“Nice project, nice initial subset of options.”
Comment from 27 May 2026 in “Show HN: Posthorn, self-hosted mail without the mail server” “An interesting combination of features.”
Comment from 27 May 2026 in “Show HN: Posthorn, self-hosted mail without the mail server”
Other email APIs people recommend
The four most recommended other email APIs, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
See all 5 email APIs, rankedWhat people said
All 10 comments that mention it, newest first. Each links to the original comment.
“that's the gap I built Posthorn to fill”
“This solves an issue that I really do have.”
“it just deploys with the apps that need it and starts working”
“exposed web service and mail server is for me high risk especially with outdated software.”
“Very little maintenance so far, mustn't speak to soon though.”
“I think Posthorn could fill a gap if it will integrate the possibility to send a webhook”
“Nice project, nice initial subset of options.”
“Posthorn listens for that connection from those apps locally and translates it into whatever your transactional mail provider needs.”
“for gluing together a bunch of different apps you're self hosting, I think this makes sense and addresses a real issue”
“An interesting combination of features.”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.