UBB.threads PHP Forum Software Community Forums UBB.threads 7 Version 7 Support Email Problem

Hi guys

My forums are not confirming email registrations to Gmail addresses from what I can see. It would appear my server or the domains on my server have been marked as spam or are being blocked by Gmail. This despite not using any kind of bulk mailing practices. We don't even have any mailing lists. We only use support/admin email and the emails associated to the forums.

Is there any known and trusted member within this community that I can hire to set up Gmails recommendations to try and prevent this problem? I have hired people before but have lost their credentials. The guy who usually helps me is, I believe, unwell and this is kinda urgent.

Thanks

Any error messages from remote servers will be contained within our mail log; example (the server IP and system response key has been removed from the below example):
The above error links to the Error Message page at Google. "Trusted" sites have a reverse DNS on their IP addresses (which must be done through your webhost, generally they don't delegate control over ip addresses to leased servers), and a DKIM or SPF policy (which I believe is default on most modern DNS configurations).

There is a vast array of items that could be going wrong, you could be blacklisted (Blacklist Check), you may not be using a SPF or DKIM key on your DNS, or users could have reported your address as spam (like the above example message), or you may not have a reverse DNS entry for your server IP address (which would get your domain blacklisted through some overzealous services).

Also, if you're sending mail from one domain (mysite@gmail.com) on behalf of another domain (forum@example.com) gmail also may be dropping the messages as well for "masquerading" as another entity.