Microsoft 365 SMTP AUTH: who still uses Basic auth? draft v0.1

Paste or open the SMTP AUTH clients report from the Exchange admin center (or read-only PowerShell output). This page lists which senders still use Basic authentication and the fix paths that apply. It runs entirely in this browser tab.

Nothing you paste leaves your computer. This page makes no network requests while you use it (its security policy blocks them), stores nothing, and sets no cookies. The only thing it can write is a CSV you choose to download.

Unverified against a real tenant. This is a draft. It has been tested only on synthetic data. It is not Microsoft software, not affiliated with or endorsed by Microsoft, and not advice for your specific tenant; check every step against Microsoft Learn before you change production mail flow.

What Microsoft says (fetched 18 Oct 2026)

Source: . Dates can change; read the live page.

1. Your report

Get it: Exchange admin center → Reports → Mail flow → SMTP AUTH clients → pick the date range (up to 90 days) → Export. ()

Open a file (CSV, JSON or text): ...or paste it here:

Optional: tenant and mailbox SMTP AUTH settings (from the read-only PowerShell script)

Paste Get-TransportConfig | Format-List SmtpClientAuthenticationDisabled output, or the mailbox settings CSV:

2. Results

The device guess comes from the sender name only. Use the drop-downs to say what you know; fix paths update immediately. "Unknown" is a valid answer.

Sender	Auth	Msgs	Type (guess)	Recipients	OAuth on device/app?	Static IP or cert?	Fix path

About this draft

No payment, account or sign-up exists for this tool. Evidence labels used in the kit documentation: [V] checked by the author by opening the page, [P] third-party write-up, [A] vendor or self-asserted claim, [G] guess.