Email Detective for Outlook: Identify ESPs & Check Authentication

See which ESP sent any email in Outlook. Detects 170+ providers and shows SPF/DKIM/DMARC authentication. Ever wonder which email marketing tool a company uses? Email Detective tells you instantly. Open any email in Outlook on the web and see a "Sent via Mailchimp" (or Brevo, HubSpot, Klaviyo, etc.) badge right on the subject line. Click it for details: vendor website, authentication status (SPF, DKIM, DMARC), and whether a shared or dedicated IP address was used. WHAT IT DETECTS: -170+ email service providers across marketing platforms, newsletter tools, CRM systems, and transactional email services -Detects Mailchimp, Brevo, HubSpot, Klaviyo, Salesforce MC and many more -Infrastructure providers like SendGrid and Amazon SES, with smart detection that shows the actual marketing platform when possible HTML builders like Stripo and BeeFree ---- Not using Outlook? We also have a version for Gmail: https://chromewebstore.google.com/detail/email-detective-for-gmail/jmflpchhakbogamlbfmlkglnpgfbhidl ---- FEATURES: -Instant ESP (email service provider) detection when you open any email -Clickable badge with ESP details popup -Email authentication checker (SPF/DKIM/DMARC) + BIMI and VMC -Shows whether it's a shared or dedicated IP (where it can be detected) -Works in your inbox list view for previously opened emails -Your email content never leaves your browser -Share anonymous meta data or opt out anytime in settings How to audit your own deliverability in seconds: -Send yourself a campaign from your own email marketing service. -Open it in Outlook, click the "Sent via" label, then "check authentication." -You'll see SPF, DKIM, DMARC and BIMI status laid out cleanly. Anything missing or failing is flagged. PERFECT FOR: -Email marketers researching competitors -Agencies evaluating client tech stacks -Deliverability specialists checking authentication -Anyone curious about the tools behind the emails they receive Built by EmailTooltester.com, the independent email tool review platform with 15+ years of testing experience. Free. No account required. No personal data collected. Please note that the plugin also exists as a Gmail version (Email Detective for Gmail). Changelog v1.2.85 - Flags emails signed with a weak security key - Spots a sender's own countdown timers and images copied from Gmail - More email platforms recognised: TailoredMail and WordPress.com newsletters v1.2.84 - More accurate badges, and emails opened from search results get theirs again - Warns when an unsubscribe link can't work, and spots text pasted from Word, Google Docs or Slack - More email platforms recognised: Mailkit, Stibee and more - Clearer privacy info when you activate, and the data switch now covers usage stats too v1.2.83 - Detects traces of ChatGPT, Claude or Gemini when the sender pasted from there directly - Spots text pasted from Word or Google Docs, and warns when an unsubscribe link can't work - More email platforms recognised: Maildroppa, Mailkit and more - Clearer privacy info when you activate, and the data switch now covers usage stats too v1.2.82 - Various detection improvements - Recognises Bloomreach in more emails, and shows details for Letter.mx v1.2.81 - New: shows when an email was written with ChatGPT, Claude or other LLMs. What's more, it'll tracking with Litmus and Validity. - Recognises more email platforms and tools, including AhaSend, LiveIntent and more v1.2.80 - Recognises more email platforms, including Adobe Journey Optimizer, FeedBlitz and more - Keeps working on all your Outlook sites when a permission check fails - Other bug fixes v1.2.79 - Better recognition of GetResponse and HighLevel emails - Bug fixes v1.2.77 - New: risk factors in the popup, the warning signs spam filters look for, such as a sender name claiming a brand the address doesn't match - Other bug fixes v1.2.77 - New: hide the badges with one click on the x, and switch them back on in settings - Recognises more email platforms - Other bug fixes v1.2.75 - Improved: clearer DMARC results, including senders with no DMARC record - New senders recognised: Newsletter2Go and ActiveCampaign on more of their sending addresses - Other bug fixes v1.2.71 - Various bug fixes - New ESPs added v1.2.66 - New sending platforms detected: ZeptoMail and Listmonk - KlickTipp is now detected on white-labelled sends - MJML added to email template detection - New setting: check every email automatically (off by default) v1.2.62 - The work Outlook notice can now be dismissed - Work Outlook can also be enabled from Settings at any time - Fixed Focused/Other being misreported in non-English Outlook - Header checks no longer depend on English button labels v1.2.60 - Works with Outlook for work and school accounts - Existing users can switch this on from the popup, no reinstall v1.2.58 - Fixed the extension needing a page refresh after it updates - Detects MoEngage, RD Station, Shopware and one more v1.2.54 - Fixed Proton Mail being reported as Postmark - Fixed a reply being credited to the newsletter it quoted v1.2.52 - Three more email platforms detected: SynXis, SMTP.com and one more (that I can't name, otherwise Chrome Web Store will say again that I am keyword spamming 🙈) - Other bug fixes v1.2.51 - Detects Cheetah Digital, MailUp and HighLevel as ESPs - Inboxroad senders are now correctly identified as Infobip - Fixed a bug where the authentication check failed on emails with very short subjects v1.2.50 - Important update: now recognises eleven more email tools: Mailrelay, Acumbamail, Webpower (and more). A friend forwarded a bunch of newsletters that weren't recognized - thank you. v1.2.49 - Detects two more sending platforms (Action Network, Mapp) - Other minor improvements v1.2.48 - Shows which certificate a sender holds (VMC or CMC) - Warns when it has expired or expires soon v1.2.47 - Fixed the provider popup drifting out of place when scrolling - Fixed opened emails being counted twice in sender s…