Using a certificate with private key encrypted

Hello friends,

I hope somebody can resolve my doubt. Can I use a certificate with
encrypted private key in qmail-ldap?

I have bought a SSL certificate for my organization. This SSL
certificate was implemented on my apache web server without problem (I
only need insert the private key's password when I start apache
service), but in the case of qmail, when I use this private key, the
service doesn't work.

Can I configure qmail in any manner for it ask me the password of
private key at first start?

I think that is not very sure store the private key without password
protection in a server exposed to Internet... If somebody break my
server, can take the private key easily.

Regards,
Fran M.