Vision6 supports full DMARC compliance.
Contact Vision6 support for DKIM configuration. For more information, visit: https://support.vision6.com.au/hc/en-us/articles/201030690-Email-Authentication-SPF-and-Domain-Keys
Add 'include:spf.v6send.net' to your SPF record. For more information, visit: https://support.vision6.com.au/hc/en-us/articles/201030690-Email-Authentication-SPF-and-Domain-Keys