Vuture marketing provide support for SPF and DKIM, however information on configuring SPF and DKIM with Vuture is available only to their registered users.
They use a number of SPF record mechanisms depending on your region.
include:spf-uk.vx-email.com
include:spf-us.vx-email.com
include:spf1-apac.vx-email.com
include:spf1-ca.vx-email.com
You could alternatively use a single include mechanism that in turn includes all of the above. It is:
include:spf.vx-email.com
If you would like to find out more about how to configure SPF and DKIM with Vuture you would either have to login to their knowledge base or email their support team for more information: https://vutu.re/contact/uk-and-europe/
Create a free OnDMARC account to test your configuration.