.NET 6 Support on Linux

Describe the bug .MSG files are not able to be read/parsed on .NET 6 when the code is running on linux.

One of the .NET 6 breaking changes is that it now no longer supports the system.drawing.common on linux. (see .net 6 breaking change here)

The exception you get is: Error Message: System.TypeInitializationException : The type initializer for 'Gdip' threw an exception. ---- System.PlatformNotSupportedException : System.Drawing.Common is not supported on non-Windows platforms. See https://aka.ms/systemdrawingnonwindows for more information. Stack Trace: at System.Drawing.SafeNativeMethods.Gdip.GdipGetGenericFontFamilySansSerif(IntPtr& fontfamily)

For .NET 5, you are able to install the linux package libgdiplus to have it work, but this no longer is a workaround.

To Reproduce Steps to reproduce the behavior:

1. Try processing a .msg email in a .NET 6 application on linux

Expected behavior The .msg email will be able to be parsed.

Desktop (please complete the following information):

• OS: Linux
• .NET 6

[Sicos1977]

Always find it funy (in a good way) that I have so much contact with people that work for Microsoft and use MSGReader (that is build by me that does not work for Microsoft)… because Microsoft invented the MSG format

[Sicos1977]

If there is still an issue than please open a new issue instead of reusing this one. I always get lost in issues that are already closed.

I just published version 5.4.0 that should get rid of the System.Drawing.Common problem on Linux because it is now only tied to the .NET 4.6.2 framework that only works on Windows