HelpingHost.com offers DomainKeys or DKIM included in each web hosting plan.
DomainKeys or DKIM is an e-mail authentication system designed to verify the DNS domain of an e-mail sender and the message integrity.

• What is the purpose of DKIM or DomainKeys? DKIM or DomainKeys allows an domain owner to take responsibility for transmitting a message, in a way that can be verified by a recipient.
• What does DKIM or DomainKeys do? Our Mail Server adds a digital signature to the message, associating it with DNS entry for a domain name.
• What does DKIM or DomainKeys cost? Nothing, Mail DomainKeys or DKIM can be enabled for your domain hosted at HelpingHost.co and each email account you like without any cost.