While attempting verify a sender profile for a Marketing Email campaign using my linked G Suite account I ran into a brick wall labeled "Please merge your SPF records".
1st - I followed the instruction in this document and created the 3 "Custom resource records"
https://support.squarespace.com/hc/en-us/articles/360001280748-Verifying-third-party-domains-for-Email-Campaigns#toc-troubleshooting-spf-records
Then the sender profile successfully validated on 2 of 3 items, the issue being the "Please merge your SPF records" - See image #1
2nd - I tried to edit the Google Synthetic "TXT @ SPF" entry to include the squarespace details but the only option is to DELETE the entire entry.
3rd - I tried adding the google details to the "TXT @ SPF" Custom resource record set up for squarespace so it would all be in one entry, but again no way to delete the G Suite synthetic entry.
4th - Long text support session with Google Domain Support. They tell me I need to delete the entire G Suite Synthetic entry and duplicate all the entries in the Customer Resource Record section but to merge the "TXT @ SPF" entry. See image #2
I'm very hesitant to do that for fear it will make an even bigger mess given the custom DNS settings are only optional and so far I haven't see issues with any major ISP (outlook, gmail, yahoo, cox, road runner) but I have to test it with some large enterprises.
Help!!!
(see attached images for details)