CentOS

Hello all , i want to connect from MS Outlook to My dovecot Server.
I read that i need to create some SSL certificate? but don't understand too much.

Would be nice if someone can explain the procedure .

IIRC you can use a self-signed cert:

1. generate a csr and key

openssl req -out $(hostname).csr -new -newkey rsa:2048 -sha256 -nodes -keyout $(hostname).key

2. sign the csr with the key

openssl x509 -req -days 3652 -in $(hostname).csr -signkey $(hostname).key -out $(hostname).crt