# EHLO – Mail Server Tester — SPF, DKIM, DMARC, SMTP & more

> SPF, DKIM, DMARC, SMTP & more (iPhone/iPad app by Christian Bumberger.)

- Source: https://appshunter.io/ios/app/ehlo-mail-server-tester/id6819353987 (this page in markdown: same URL + `.md`)
- Developer: [Christian Bumberger](https://appshunter.io/developer/939556226)
- Category: Developer Tools, Utilities
- Price: $8.99
- Age rating: 4+
- Requires: iOS 17.0 · 10 MB
- Languages: American English, German (Germany)
- Released: 2026-10-07
- Data updated: 2026-10-08

## What is EHLO?

EHLO is the mail tool for everyone who runs mail servers: it checks whether a domain is properly protected against forged senders, tests SMTP servers all the way to a delivered test message, and explains why a message ended up in spam. All in plain language instead of raw data.

CHECK A DOMAIN
• MX, SPF, DKIM, DMARC, MTA-STS, TLS reporting and BIMI at a glance, with a rating for each
• Every finding in one clear sentence, plus a concrete hint on what to improve
• SPF: counts DNS lookups across all “include” entries and warns before the limit of 10
• DKIM: tries the common selectors by itself, and you can enter your own; warns about short or revoked keys
• MTA-STS: loads the policy and checks that it covers all mail servers
• The DNS records found, verbatim, to copy and share

BLOCKLISTS AND REVERSE DNS
• Checks a domain's mail servers and the domain itself against 16 DNS blocklists
• Enter an IP address: reverse DNS in both directions and all blocklists for exactly that server
• Says so honestly when a list gives no answer through the device's DNS service, instead of reporting “clean”

MONITORING
• Have domains and IP addresses checked regularly in the background
• Notification when MX, SPF, DKIM, DMARC or MTA-STS change or a server lands on a blocklist
• Change log with the state before and after, record by record
• A difference is only reported once a second lookup confirms it

SMTP TEST
• STARTTLS, implicit TLS or unencrypted, any port
• Sign-in with PLAIN, LOGIN, CRAM-MD5 or XOAUTH2 (access token)
• Test message with CC, BCC, HTML version, custom headers and attachments
• Complete session log with timings, colored and copyable; passwords and tokens never appear in it
• Templates for common providers, saved servers with the password in the keychain
• History of all tests, searchable by server, recipient and log text

ANALYZE HEADERS
• Paste a message's headers: the route from server to server with transit times and delays
• SPF, DKIM and DMARC results, encryption of each hop, spam rating
• Explains what the findings mean

SECURITY AND PRIVACY
• App lock with Face ID, Touch ID or device passcode
• Encrypted backup of servers and domains (AES-256) to move to another device
• No account, no ads, no tracking. EHLO talks only to the servers you enter and to your device's DNS
• Header analysis runs entirely on the device

For iPhone, iPad and Mac, one purchase for all devices. English and German.

Note: on iPhone and iPad the system decides when a background check runs; on the Mac, checks run while EHLO is open. An overdue check is caught up when you open the app.

## Is EHLO safe?

Not enough ratings yet to assess EHLO.

## Is EHLO legit?

EHLO – Mail Server Tester appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for EHLO is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-07

No release notes.

## More apps by Christian Bumberger

- [Parking Heater Remote](https://appshunter.io/ios/app/parking-heater-remote/id6816491689)
- [Switchworks](https://appshunter.io/ios/app/switchworks/id6817462910)
- [NotAfter: TLS Monitor](https://appshunter.io/ios/app/notafter-tls-monitor/id6818526699)

All apps by Christian Bumberger: https://appshunter.io/developer/939556226

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-08.*