GPG email banned from Microsoft servers

hello guys,

this is not 100% related to the ISPConfig, but I am using this to send out emails so I am any info is useful.
The issue that I have is that I have in my Thunderbird the GPG encryption installed and working but when I send to a Microsoft email address I always get a ban because of the .asc file that comes with the GPG. The message from Microsoft is that this is a wrong file type to send, but then the question is how do you send emails to Microsoft users with or without the .asc file?

Sorry if this is posted in the totally wrong place