Products

SMTP Field Manual

A collection of raw SMTP error codes spotted in the wild

smtpfieldmanual.com Source★ 3Software Development / Developer Docs & Portals

AI Benchmark
Desktop
Mobile
Monthly visits
<5K
Sep 2026
Public revenue
Undisclosed
No public revenue evidence yet
Entry price
Free
No monthly subscription pricing
Creators
Chris Nagele
@cnagele· 1,967 followers
Launched
7y ago
2019-11-05 · Est.

Traffic

Monthly visitsData through Sep 2026 · Oct 2026 pending

Marketing moves

Launches, search & content, referrals, promotions
X accounts@beanstalkapp@cnagele

  • Launched on Product HuntLaunch

    A collection of SMTP error codes from major inbox providers.

    Nov 5, 2019 · 7y agoLaunch page

Open Source & Self-Hosting

GitHub · MCP / Skill
activecampaign/smtp-field-manual
GitHub Stars
★ 3
Forks
4
License
See repository
Primary language
—
Browse peer open-source projects →

Traffic sources

Sep 2026

Traffic breakdown

Channels

  • Direct39%
  • Organic Search36%
  • Referrals9%
  • Social6%
  • Other10%

Countries

  • India69%
  • Netherlands31%

Search

Domain authority —Domain registered 2019-09-18

KeywordMonthly volume
comcast.net8,190
mail.qq1,690
error code 5521,170
550 permanent failure for one or more recipients760
smtp field manual10

Traffic data: Vaneform

Pricing

Pricing page not identified yet, or no public pricing listed.

Pages & changes

Tracked since 2019-11-05

Key pages

Weekly snapshots

Changes

No pricing, plan, or positioning changes detected since tracking started.

Questions & evidence

How much website traffic does SMTP Field Manual get?
Vaneform estimates <5K website visits in 2026-09. Visits can include repeat visits; this estimate measures web traffic separately from paying customers or revenue.Source
What is SMTP Field Manual and what platforms does it support?
SMTP Field Manual is catalogued under Developer Docs & Portals: A collection of raw SMTP error codes spotted in the wild. Supported platforms: Web.
Is SMTP Field Manual open source?
SMTP Field Manual has a public repository (https://github.com/activecampaign/smtp-field-manual) with its source repository published, recording 3 GitHub stars.Source

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