Choose the appropriate GemBox.Email.dll file for your project from the following options:

• GemBox.Email for .NET Framework 4.6.2
  Folder: net462
  Usage: When your project targets the .NET Framework 4.6.2 or above.
  Dependencies:
  - BouncyCastle.Cryptography (>= 2.4.0)
  - Microsoft.Bcl.Numerics (>= 9.0.0)
  - Pkcs11Interop (>= 5.1.1)
  - System.Buffers (>= 4.6.0)
  - System.Runtime.CompilerServices.Unsafe (>= 6.1.0)
  - System.Text.Json (>= 8.0.5)
  - System.ValueTuple (>= 4.5.0)

• GemBox.Email for .NET Standard 2.0 (on Android, iOS, Linux, macOS, Windows)
  Folder: netstandard2.0
  Usage: When your project targets .NET Standard 2.0 compatible version, see: https://learn.microsoft.com/en-us/dotnet/standard/net-standard?tabs=net-standard-2-0#select-net-standard-version
  Dependencies:
  - Microsoft.Bcl.Numerics (>= 9.0.0)
  - Pkcs11Interop (>= 5.1.1)
  - Portable.BouncyCastle (>= 1.9.0)
  - System.Buffers (>= 4.6.0)
  - System.Runtime.CompilerServices.Unsafe (>= 6.1.0)
  - System.Text.Encoding.CodePages (>= 6.0.0)
  - System.Text.Json (>= 8.0.5)