Why is my email being marked as Spam
In order to help combat the ever increasing amount of Spam being sent, many third-party mailserver sites have implemented mail policies based on DMARC (Domain-based Message Authentication, Reporting, & Conformance).
DMARC is basically a DNS record which specifies how your mail should be handled by third-party mail servers. What email addresses are delivery failures reported to, what to do with mail from this domain that fails the check, etc. If you do not have a DMARC record, third party mail servers might recognize mail from your domain as Spam, whether it is legitimate or not.
Gmail and Yahoo have implemented especially strict DMARC polices, which can cause issues with people not receiving mail from your domain at all, if you do not have properly configured DMARC policies published to DNS.
In order to have the best chance of your mail to be delivered successfully, you will want to make sure that you have valid SPF, DKIM and DMARC records set up. The following Knowledgebase articles will help you configure these records.
Configuring SPF and DKIM:
https://kb.acenet.us/How_to_enable_Email_Authentication
How to configure your DMARC record:
https://kb.acenet.us/DMARC
If you have any questions, or need assistance with setting these up, please login to our online Helpdesk and open a new technical support ticket.