SendGrid DKIM and DMARC setup

In addition to the DNSSEC issue:

That last TXT record you have there, is not valid according to the expected outcome.

include:_spf.sirvoy.com” shouldn’t be standing alone like that, but be included in the appropriate SPF record for the given (sub-)domain that Sirvoy’s booking software is sending with.

A proper record would be like “v=spf1 include:_spf.sirvoy.com -all”, assuming that you’re only using Sirvoy to send messages using the given (sub-)domain.