I'm running on Rackspace Cloud Servers and I've just setup a CentOS build and installed iRedMail. The problem is, 90% of the email I'm sending gets blocked and I get the error in my maillog:
NOQUEUE: reject: RCPT from unknown[18.104.22.168]: 450 4.7.1 <email@example.com>: Recipient address rejected: Policy Rejection- Please try later.; from=<firstname.lastname@example.org> to=<email@example.com> proto=ESMTP helo='<mail-pz0-f185.google.com>
For spam reasons I've taken out the real emails and put in pseudo ones.
I asked the technical support for some help and it wasn't much help. I've setup the SPF and TXT records but still no luck.
Any tips on what I could try or what I should look at or is this a ridiculous too open a question with too many things that could cause the issue?
Any help would really be appreciated. This is my first time setting up postfix from scratch :|
edit: somebody just told me that the emails are being 'greylisted' by my postfix setup to avoid being spammed.