You have a few options. All involve the use of openssl to generate key or csr

See https://www.madboa.com/geek/openssl/

1. Create a self signed cert and point Postfix to use ssl key and pem which was 
self generated
2. Use letsencrypt (HIGHLY recommended). IMHO, the introduction of letsencrypt 
will kill the basic ssl cert signed market.
3. Get a signed cert from namecheap. (You can alway buy a throwaway domain and 
add positivessl cert for a year for US $1.99

________________________________________
From: netbsd-users-ow...@netbsd.org <netbsd-users-ow...@netbsd.org> on behalf 
of Marco Beishuizen <mb...@xs4all.nl>
Sent: Sunday, February 28, 2016 5:35 PM
To: netbsd-users@netbsd.org
Subject: create keys and certificates for postfix/tls

Hi,

I'm trying to make Postfix work with TLS enabled. Looks like I need some
certificates and keys. How do create them on NetBSD 7.0?

Thanks in advance,
Marco

--
You've been leading a dog's life.  Stay off the furniture.

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