How can I stop spam filters from blocking inbound email?
You can offset spam filters for a sending domain, specific to your account, by dropping into cPanel and going into Spam Filters. From there you can whitelist domains under the “Show Additional Configurations” section. It needs to be the domain in the From header that you whitelist, not who you think it’s from, that is very important.
If you do need support still, please provide information that we can use to hunt down the rejection. If it is many, please still pick one. We cannot give a specific answer to a non-specific question, please humor us on this.
Please note that there is no way to disable all filtering. We run an environment for a large number of customers, accepting all email without filter would mean accepting no email, because no server can withstand that. No mail service accepts all mail without filter. Any server that does, while having any reasonable number of customers on it, can only stand temporarily.