Need help? Reach us at 
+1 (855) 418-2323
Need help? Reach us at
+1 (855) 418-2323
File Converters TIFF and PDF apps Forensic FreewareSearch PST, EML, MBOX, MSG, and OST email files by keyword for legal, forensic, and personal use.
Windows
2000/2003/Vista
7/8/10/11/Citrix
You have thousands of emails saved on your computer as PST, OST, EML, MSG, MBOX, or EMLX files. You need to find the one that mentions a specific keyword, a date, or a sender. Mail Terrier scans your drives, indexes every email file it finds, and lets you search through them in seconds.
Mail Terrier works with all major email file formats stored on your hard drive:
No need to install Outlook or any other email client. Mail Terrier reads email files directly from disk.
Search by a single keyword, a phrase, or build advanced rules using AND, OR, and NOT operators. Filter by sender, recipient, subject line, date range, or message body. Set proximity rules to find emails where two words appear within a specific distance of each other. For example: find emails containing "contract" and "renewal" in the body, within 3 words of each other, but excluding emails with "spam" in the subject.
Mail Terrier displays a list of matching emails with full metadata: sender, recipient, subject, date, and file path. Preview any email with a double click — view HTML, plain text, or headers. Export selected emails to PDF, TEXT, TIFF, EML, or MSG. Export the results list to PDF, XLS, or DOC with all properties for reporting and documentation.
Mail Terrier creates an index of all email files on your drive. The initial scan takes a few minutes depending on the volume of data. After that, every search returns results in seconds — even across gigabytes of archived email. Search history is saved, so you can repeat any previous search instantly.
Free for personal use at home. For commercial use in legal, forensic, compliance, or business environments, a license costs $199.
(includes 30 day FREE trial)
(only $199.00)
"We've been using Mail Terrier for a legal matter to search outlook email by keyword and are happy with the results. It works fast and is powerful enough for a complicated macro task. Highly recommend this app for key word search."
Wilf Schreiber
Attorney
"I had to find all emails related to a particular case for the judge and opposing council. I would not be able to do that without Mail Terrier. Manual email search by keyword would take hours. It scanned my 1Gb PST file and produced the list of necessary emails in minutes! Thank you very much."
Chaow
Dong Design, Thailand
Anyone who needs to find the right email among thousands in seconds
Find key emails across PST, MSG, and EML archives
Law firms and litigation teams use Mail Terrier to search gigabytes of email archives for specific correspondence. Build complex search rules combining keywords, date ranges, and senders to locate critical evidence, then export results to PDF or Excel for case preparation.
Locate emails across multiple mailbox formats
IT departments search through orphaned mailboxes, backup PST files, and exported MBOX archives to find lost emails for users. Mail Terrier scans entire drives for email files automatically, regardless of which email client originally created them.
Search employee correspondence for policy violations
Compliance officers search archived email stores for specific terms, phrases, or communication patterns that may indicate policy violations. Export search results as structured reports in XLS or DOC format with full metadata for audit documentation.
Find old emails on your computer in seconds
Home users and professionals with years of accumulated email archives use Mail Terrier to instantly locate invoices, receipts, contracts, or personal correspondence buried in thousands of files. Free for personal use with no trial limitations.
Scan drives for all email files and search within them
Forensic investigators point Mail Terrier at seized drives to discover all email-related files across MSG, EML, EMLX, PST, and MBOX formats. Then search within the found files using advanced rules to isolate relevant communications and export evidence.
Updated Sun, 18 Jan 2026
(only $199.00)
Wondering how to search keywords in email files stored on your computer? Mail Terrier makes it simple in three steps.
Step 1 — Select email folders. Set the folders containing your email files. For Outlook emails, point to your PST or OST file. For Thunderbird or Google Takeout, select the folder with MBOX or EML files. Mail Terrier will scan the selected folders and create an index of every email it finds. If you need to search Gmail emails, export them from Google Takeout first and then point Mail Terrier at the downloaded MBOX file.
Step 2 — Set the search rule. Enter the keyword, phrase, or combination of rules. Choose where to search: entire email, subject line only, body only, or headers. Set a date range or filter by sender. Use AND, OR, NOT operators to build precise queries.
Step 3 — Press Search. Mail Terrier displays a list of matching emails with sender, subject, date, and file path. Preview any email with a double click. Export results to PDF, XLS, or DOC. The search takes seconds once the index is built, even across gigabytes of data.
Updated Sun, 18 Jan 2026
(only $199.00)
Updated Sun, 18 Jan 2026
(only $199.00)
Download free trial and convert your files in minutes.
No credit card or email required.
