I use a self signed certificate with my mail server. I use dovecot and postfix startTLS. I also have a DKIM setup for digital signatures and everything is working. However, when sending mail to hotmail or outlook it often if not always falls into the client spam unless they request to trust.
I wouldn't make any difference if I would pay to have a signed certificate authority would it? I mean a certificate guarantees that when thunderbird connects to my server to send the email it's encrypted, once postfix sends this to the target host there is no guarantee it then is still encrypted. So self sign or paid cert I don't gain a "whitelist reputation" with big box companies like outlook or hotmail? Which is always the problem- I never have issues with gmail.
I want to try and get on hotmail/outlook.com's accepted mail reputation and my mail is encrypted with digital signatures. Any advice would be welcome.
My ip/domain has a good reputation etc.