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Postbox Services

ChatGPT plugin

Email deliverability checks

View in ChatGPT directory

Run live email deliverability and security checks from ChatGPT and get answers from real lookups, each with a link to a full report.

Check a domain or IP against email blacklists, grade a domain's spoofing and business email compromise exposure from SPF, DKIM and DMARC, and trace a link through every redirect to where it really goes.

Test a real email: get a disposable address, send a message to it from your own system, and get a score out of 10 with a breakdown and fixes. You can also analyze a raw .eml file.

Look up a domain's age and WHOIS details, check a BIMI record and logo, and grade how visible a website is to AI answer engines.

No sign-in is needed. Postbox Services is run by Postbox Consultancy Services, an email deliverability consultancy.

Postbox Services is #11,825 of 13,927 ChatGPT plugins by placement.

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Rank by placement

#11825of 13,92720places up24h—7d
#11,706#12,063#12,420#12,777#13,134Oct 17Oct 23Oct 29Nov 4Nov 10Nov 15

Rank in Developer tools

#943of 1,0651places up24h—7d
#939#954#969#984Oct 17Oct 23Oct 29Nov 4Nov 10Nov 15

In its category

How this plugin compares with others in the same category. Positions are counted within the category, not across the whole directory.

Developer tools943rd of 1,065 by placement
#PluginPosition7d
941EasyCircuit#11701—
942AODACheck#11760—
943Postbox ServicesThis page#11825—
944QualiPulse Broken Link Checker#11828—
945SEC API — sec-api.dev#11835—

All 1,065 Developer tools plugins

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Skills

  • email-checks

    Choose the right Postbox Services check for an email deliverability or email security question, and explain the result. Use when someone asks about blacklists, spoofing, spam tests, bounces, redirects, domain age, WHOIS, BIMI or AI discoverability.

Categories
Made by
Postbox Consultancy Services · Website
Sign-in
On Install
Capabilities
Check email blacklists, Grade spoofing exposure, Trace URL redirects, Run an email deliverability test, Analyze a raw email file, Look up domain age and WHOIS, Check a BIMI record and logo, Grade AI discoverability
Availability
Available
Version
1.0.0
Keywords
email, deliverability, blacklist, dmarc, spf, bimi, whois
Created
November 5, 2026
More info
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