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MailCheck: SMTP Test & Debug

by 倩 罗

  • Developer Tools
  • Paid
View on the App Store
Rating
0.0
0 ratings · Greece storefront
Last update
Feb 3, 2026
Version 1.0.1
Size
6 MB
Category
Developer Tools
Tracked since
Oct 10, 2026

Estimated revenue

A model estimate with a likely range, not a reported figure.

No estimate. Apps outside the grossing charts, and some countries, have no reliable rank-to-revenue curve, so we show nothing rather than a guess.

How this estimate is made

Rank: we take the app's best Top Grossing rank on the latest chart day. Category ranks are converted into an equivalent overall rank, because a #10 in Finance earns far less than a #10 overall.

Curve: that equivalent rank is read off a rank-to-revenue curve anchored on public company revenue and market-data reports for the US iPhone App Store.

Country: the curve is scaled per country (Japan is roughly a third of the US, Türkiye under 1%). Where we have no scale, such as China, there is no estimate.

Range: the likely range widens with country, category and chart depth. It is a plausible span, not a statistical confidence interval.

Not included: ads, payments outside the App Store, and any difference between gross sales and what the developer keeps. Low confidence means indirect data; medium means several independent sources agree.

Full method

Screenshots

As shown on the App Store listing.

About this app

Text from the App Store listing.

MailCheck is the ultimate SMTP diagnostic tool designed for system administrators, developers, and IT professionals.

Stop guessing why your emails aren't sending. MailCheck gives you a direct look into the server conversation, helping you debug connectivity issues, verify SSL/TLS configurations, and test authentication credentials in seconds.

KEY FEATURES:

  • Real-time SMTP Testing: Connect to any SMTP server (Gmail, Outlook, Office365, or custom servers) and verify connectivity instantly.
  • Raw Server Logs: View the full verbose transcript of the client-server handshake. See exactly where the error occurs (e.g., 535 Authentication Failed, Timeout, or Certificate errors).
  • Smart Port Configuration: Automatically toggles between SSL/TLS (465), STARTTLS (587), and Plain Text (25) based on your port selection.
  • Security First: Verify if your server supports modern encryption standards.
  • Privacy Focused: Passwords are NOT stored. All credentials are held in volatile memory (RAM) only during the session and are wiped immediately upon app termination.

PERFECT FOR:

  • Testing new mail server setups.
  • Debugging firewall or port blocking issues.
  • Verifying "App Passwords" for third-party services.
  • IT Admins troubleshooting client email configurations.

MailCheck is ad-free, lightweight, and built for speed.

[Note: This app is a diagnostic client and does not provide an email inbox service.]

Rank history

Daily position in the Switzerland charts. #1 is at the top.

Best rank
#2
Current rank
#2
Days charting
1 of 7

On the charts today

Small & simple score

How realistic it is for a small team to build something like this.

74/100

Not flagged as small & simple

  • Developer size40% · 25

    Developer: 3 apps on the charts

  • Audience size– · 20

    No data, weight redistributed

  • App size100% · 10

    Size: 6 MB

  • Price model100% · 15

    Price model: paid

  • Demand proof80% · 30

    Best rank #2, 4 countries

An indicator, not a fact. We can't see team size. Calculated Oct 25, 2026 · method i2

How the score works

Version history

  • 1.0.1LatestReleased Feb 3, 2026