Subject Unique ID

Hello! I've read about a field called Subject Unique ID and would like to fill it with the customer-number, but I haven't managed to do this. Can someone tell me, how to do this? Thank you all for your help! Stephan __ OpenSSL

Creating certificates with more than one eMail address

Hello! Is it possible to create certificates with more than one eMail address? I want to create a cert which can sign mails from different eMail addresses. Is that possible? And if it is, how can I do it? Thank you for your help! Stephan