How to Search Email Text with GroupDocs.Watermark Java

Finding a specific phrase inside an email’s subject, body, or attachments can be a headache—especially when you’re handling dozens or hundreds of messages. In this tutorial you’ll discover how to search email content quickly and accurately using GroupDocs.Watermark for Java. We’ll walk through setup, code, and best‑practice tips so you can integrate email text search into your own applications with confidence.

Quick Answers

  • What library lets me search email text in Java? GroupDocs.Watermark for Java.
  • Do I need a license? A free trial works for testing; a paid license is required for production.
  • Can I search both subject and body? Yes—configure EmailSearchableObjects to include Subject, HtmlBody, and PlainTextBody.
  • Is the API case‑sensitive? You can choose case‑insensitive searches by setting the appropriate flag in TextSearchCriteria.
  • What Java version is required? JDK 8 or higher; Maven is recommended for dependency management.

What is “how to search email” with GroupDocs.Watermark?

GroupDocs.Watermark provides a unified API for locating, removing, or modifying watermarks and plain text across many document types—including email messages (.msg, .eml). By leveraging its searchable objects model, you can target exactly the parts of an email you care about, making bulk processing fast and reliable.

  • Unified API – Works with PDFs, images, Office files, and emails using the same code patterns.
  • Performance‑optimized – Search operations run in memory without needing external services.
  • Robust handling – Supports HTML and plain‑text bodies, attachments, and even password‑protected emails.
  • Easy integration – Maven/Gradle ready, with clear documentation and active support.

Prerequisites

  • Java Development Kit (JDK) 8 or newer.
  • Maven (or Gradle) for dependency management.
  • An IDE such as IntelliJ IDEA or Eclipse.
  • Basic familiarity with Java syntax and email file formats (.msg, .eml).

Setting Up GroupDocs.Watermark for Java

Maven Setup

Add the repository and dependency to your pom.xml:

<repositories>
   <repository>
      <id>repository.groupdocs.com</id>
      <name>GroupDocs Repository</name>
      <url>https://releases.groupdocs.com/watermark/java/</url>
   </repository>
</repositories>

<dependencies>
   <dependency>
      <groupId>com.groupdocs</groupId>
      <artifactId>groupdocs-watermark</artifactId>
      <version>24.11</version>
   </dependency>
</dependencies>

Direct Download

Alternatively, you can download the latest JAR from GroupDocs.Watermark for Java releases.

License Acquisition

  • Free Trial: Test core features without a license key.
  • Temporary License: Request a time‑limited key for extended evaluation.
  • Paid License: Purchase for unlimited production use.

Basic Initialization

import com.groupdocs.watermark.Watermarker;
import com.groupdocs.watermark.options.EmailLoadOptions;

EmailLoadOptions loadOptions = new EmailLoadOptions();
Watermarker watermarker = new Watermarker("input_email.msg", loadOptions);

Implementation Guide

Feature 1: Search Text in Email Body

Overview

We’ll configure the API to scan the subject, HTML body, and plain‑text body of an email for a given keyword.

Step 1: Define Document Paths

String inputDocumentPath = "YOUR_DOCUMENT_DIRECTORY/message.msg";
String outputDocumentPath = "YOUR_OUTPUT_DIRECTORY/output_message.msg";

Step 2: Set Up Load Options and Watermarker

EmailLoadOptions loadOptions = new EmailLoadOptions();
Watermarker watermarker = new Watermarker(inputDocumentPath, loadOptions);

Step 3: Create Search Criteria

import com.groupdocs.watermark.search.SearchCriteria;
import com.groupdocs.watermark.search.TextSearchCriteria;

SearchCriteria criteria = new TextSearchCriteria("test", false);

Step 4: Specify Search Locations

watermarker.getSearchableObjects().setEmailSearchableObjects(
    EmailSearchableObjects.Subject |
    EmailSearchableObjects.HtmlBody | 
    EmailSearchableObjects.PlainTextBody);

Step 5: Execute Search and Clear Watermarks

import com.groupdocs.watermark.search.PossibleWatermarkCollection;

PossibleWatermarkCollection watermarks = watermarker.search(criteria);
watermarks.clear();

Step 6: Save Changes

watermarker.save(outputDocumentPath);
// Close the Watermarker instance to release resources
watermarker.close();

Troubleshooting Tips

  • Empty results: Verify that the keyword actually appears in the selected email parts.
  • Performance: Limit the searchable objects to only those you need (e.g., Subject + PlainTextBody) to speed up large batches.

Feature 2: Load Email Document Options

Overview

EmailLoadOptions lets you control how the email is parsed—useful for encrypted messages or custom encodings.

Step 1: Configure Load Options

EmailLoadOptions loadOptions = new EmailLoadOptions();
// Additional configurations can be added here.

Key Configuration Options

  • Password Protection: Set loadOptions.setPassword("yourPassword") for encrypted .msg files.
  • Encoding Settings: Adjust loadOptions.setEncoding(Charset.forName("UTF-8")) when dealing with non‑standard character sets.

Practical Applications

  • Automated Email Processing: Bulk‑scan incoming support tickets for keywords like “refund” or “error”.
  • Legal Compliance Checks: Quickly locate confidential terms (e.g., SSN, credit‑card numbers) across corporate mail archives.
  • Customer Support Automation: Route emails based on detected phrases to the right support team.

Performance Considerations

  • Resource Management: Call watermarker.close() as soon as you finish processing to free native resources.
  • Memory Best Practices: When handling thousands of messages, process them in batches and reuse the Watermarker instance where possible.

Conclusion

You now have a solid, production‑ready approach for how to search email content using GroupDocs.Watermark Java. The API’s flexibility lets you target specific parts of an email, clear unwanted watermarks, and integrate the logic into larger workflows.

Next Steps

  • Experiment with multiple search criteria (e.g., combine “invoice” + “overdue”).
  • Explore watermark addition to flag emails that contain sensitive data.
  • Dive into other document types (PDF, DOCX) using the same Watermarker workflow.

Frequently Asked Questions

Q1: How can I handle encrypted emails with GroupDocs.Watermark?
A1: Use EmailLoadOptions.setPassword("yourPassword") before creating the Watermarker instance.

Q2: Can I search for multiple keywords at once?
A2: Yes—create separate SearchCriteria objects for each keyword and combine them with logical operators (e.g., OrSearchCriteria).

Q3: Is GroupDocs.Watermark Java free to use?
A3: A free trial is available for evaluation. For production use, a paid license is required.

Q4: How do I handle large volumes of emails efficiently?
A4: Limit the searchable objects to only those needed, process emails in batches, and always close the Watermarker to release resources.

Q5: Where can I find additional help or support?
A5: Visit the GroupDocs forum for community assistance or contact GroupDocs support directly.

Resources

Last Updated: 2025-12-31
Tested With: GroupDocs.Watermark 24.11 for Java
Author: GroupDocs