For a domain email to work properly via WIX , an email authentication DNS SPF record should be added to the domain. In the case of Wixdns.net (WIX) name servers (NS), the corresponding authentication record must be added via their control panel.
The value of the Zone SPF record is following:
TXT "v=spf1 a mx include:_spf.zone.eu -all"
In the WIX control panel, you should first go to the domains view: Domains. Then you should click on Manage DNS Records for the desired domain.
After making the appropriate selection, a new record should be added, i.e. + Add Record, and the record type, i.e. type, must be TXT (do not set “type” to “SPF”).
When adding a record, the Host field must be left empty, the Value field must be filled with the value of the Zone SPF record, i.e. v=spf1 a mx include:_spf.zone.eu -all.
When adding an SPF entry, the WIX help article can be helpful: https://support.wix.com/en/article/adding-or-updating-spf-records-in-your-wix-account
After adding the corresponding SPF entry, the change will take effect within 1-2 hours (DNS propagation speed).