Add watermarks to email attachments

The API allows you to add watermark to all the attachments of supported types in an email message as shown in the following code sample.


TextWatermark watermark = new TextWatermark("Test watermark", new Font("Arial", 19));
EmailLoadOptions loadOptions = new EmailLoadOptions();
// Constants.InMessageMsg is an absolute or relative path to your document. Ex: @"C:\Docs\message.msg"
using (Watermarker watermarker = new Watermarker(Constants.InMessageMsg, loadOptions))
    EmailContent content = watermarker.GetContent<EmailContent>();
    foreach (EmailAttachment attachment in content.Attachments)
        // Check if the attached file is supported by GroupDocs.Watermark
        IDocumentInfo info = attachment.GetDocumentInfo();
        if (info.FileType != FileType.Unknown && !info.IsEncrypted)
            // Load the attached document
            using (Watermarker attachedWatermarker = attachment.CreateWatermarker())
                // Add wateramrk

                // Save changes in the attached file

    // Save changes

Advanced use cases

More resources

GitHub examples

You may easily run the code above and see the feature in action in our GitHub examples:

Free online document watermarking App

Along with full featured .NET library we provide simple, but powerful free Apps.

You are welcome to add watermark to PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, Emails and more with our free online Free Online Document Watermarking App.

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