What form of DNS record entry can be used for incoming mail load balancing?

A domain can have multiple Mail Exchanger (MX) records that specify distinct mail servers for load balancing. Direct Connect (DX) is a dedicated Amazon Web Services connection between the client and AWS. In a DNS record, AAAA represents an IPv6 address, while TXT DNS records allow an administrator to include text in their DNS record. These text records can be used to protect against email spam.