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.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.Text.Encoding.CodePages >=6.0.0
 - System.Text.Json >=8.0.5