secure password communication

[sfmailsbm () gmail com]

Dear List,
we need to communicate first-time application passwords to remote users; wanted to know what are the practices 
implemented out there to ensure that password is communicated in a secure, fast, cost-effective way

encrypted mails is not feasible for the time being, printing PIN Mailers and sending by post will be too lengthy

any ideas will be appreciated

many thanks,
Ron