lyle.FluentEmail.Graph 4.0.0

FluentEmail - All in one email sender for .NET and .NET Core

Microsoft Graph Sender for FluentEmail

Send emails via Microsoft Graph's APIs

FluentEmail Temporary Fork

This is a temporary fork of the FluentEmail project.

Why this fork exists

I submitted an issue to the original repository (https://github.com/jcamp-code/FluentEmail/issues), but since I couldn't wait for the official update, I created this temporary library with a minor bug fix.

Usage Notice

• I strongly recommend using the original FluentEmail library instead of this fork
• This library is exclusively for my personal use.
• I cannot guarantee timely updates, maintenance, bug fixes, or compatibility with future versions of the official FluentEmail library (including .NET 8.0/9.0/10.0 support).
• Once the original maintainer of jcamp-code/FluentEmail releases an update that resolves the issue I submitted, this custom library will be deprecated immediately.

Changes Made

• [2026-01-29] [Add Content-Id mapping for inline attachments]

// GraphSender.cs
// Add 'GraphSender' constructor
public GraphSender(GraphServiceClient graphClient, bool saveSentItems)
{
    _graphClient = graphClient;
    _saveSent = saveSentItems;
}

// Add Content-Id mapping for 'SendAsync' method
if (email.Data.Attachments != null && email.Data.Attachments.Count > 0)
{
    message.Attachments = new MessageAttachmentsCollectionPage();

    email.Data.Attachments.ForEach(a =>
    {
        var attachment = new FileAttachment
        {
            Name = a.Filename,
            ContentType = a.ContentType,
            ContentBytes = GetAttachmentBytes(a.Data),
            IsInline = a.IsInline,
            ContentId = a.ContentId
        };

        message.Attachments.Add(attachment);
    });
}

// FluentEmailGraphBuilderExtensions.cs
// Add 'AddGraphSender' extension method
public static FluentEmailServicesBuilder AddGraphSender(
            this FluentEmailServicesBuilder builder,
            TokenCredential tokenCredential,
            bool saveSentItems = false)
{
    builder.Services.TryAdd(ServiceDescriptor.Scoped<ISender>(_ => new GraphSender(new GraphServiceClient(tokenCredential), saveSentItems)));
    return builder;
}

License

Same as the original FluentEmail project.

Disclaimer

This custom build is not affiliated with, endorsed by, or associated with the official FluentEmail project, its maintainers (including jcamp-code), or the original author @lukencode. It is provided for personal use only, and any use of this library is at your own risk. The MIT License of the original FluentEmail project applies to this custom build, with all original copyright notices preserved.