Hello, for some reason on postfix, when I try to switch my steam email or try to confirm my paypal email, it won't seem to receive the confirmation emails. I looked in /var/log/mail.log which doesnt even show that i got any mail, so no errors in mail.err. I just validated my SPF record, and it still persists. I'm not sure what it is about these emails that won't receive in postfix, but I can receive other confirmation emails just fine from other services and I can receive gmail/hotmail/etc just fine too.

Here's my main.cf: http://sprunge.us/DRLV
Here's my master.cf: http://sprunge.us/hPde

Just a guess, but they might be in the junk mail filter.
Either yours, or your ISPs.

They're not in junk. Postfix doesnt even log the emails being received.

Then check to see if your ISP blacklisted them at some point.

By ISP you're referring to the server hosting?

Hmmm.... If your running this thing in a virtual domain with an external IP, they probably aren't blacklisting anything (though you could check).
It could be they are mangling the domain in some way, this is particularly true if you are using a sub-domain. It may just be that your domain is not well enough known.
As a percentage of mail messages received what percentage are being lost?
Do you have any of the original messages to include the headers (i.e. they "bounced" and were successfully resent)?

the percent is very low. To this day, these and ubuntu cloud (last time i checked, i havnt checked in a while) are the only 3 that I cannot receive from. And no, i never received 1 email from them in my inbox or any other folder.

I think it can be one of these things:

1) they filtered out my email
2) the fact my dkim is not set up yet
3) there's a weird misconfiguration in my dns or postfix config

Based on the fact these are automated responses, I'd say it's probably more likely their dkim is the problem, but without a bounced header to check, it's just a guess.

How am I able to get/replicate a bounced header in that case?

Also I forgot to mention, I'm not using a subdomain in general (I am using one for my mail server however)