Please check DNS change request

Please check this DNS change request I have from an outside email provider - for dangerous code. My Squarespace site ma.nj.org has a request from client to use their existing email provider. He sent a request for DNS changes. The MX records look straight forward, but I am not sure if the Autodiscover or the TXT records have the ability to cause trouble to the site. I would appreciate any help.

Here is the request: 

A    Autodiscover          64.247.29.164

MX         mx1.mtaroutes.com

MX         mx2.mtaroutes.com

MX         mx3.mtaroutes.com

MX         mx4.mtaroutes.com

TXT       @                         v=spf1 include:spf.mtaroutes.com include:sendgrid.net ip4:64.247.29.164 -all

TXT        _dmarc              v=DMARC1; p=quarantine; pct=100 

v=DKIM1; k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzoN4yx5RIObauG22ukP3kRpgqKdjQ+JUdISbxlnEc7/6CkeDOd6OixJ1ItPBGXWW8BM3toWH/L7mWJbFl/rfeeHdPsTW++iWFsH6Hn+DtRtCzNqcS+xH6AilLOWLMoNJj8Zcz0Q450bXhhHXhudAPkz3uMHv56mRY1qEPS00sL7LxxQ6fjF1DXUzjgIlL+mXXlfkL4hWv7iIVcGLKcAQYUzlOIQvFoVHz8JQQKTaBi6YOAexObYsJX97HTRiQqqP/WJ/u4mn4N2ElsJuXScOBrZqkYf9A7kCS4ChmAE+B80a4YGN1LCRMfkeqbyBh68Kq2510AVbERD1QRr2ZblEdQIDAQAB;

I believe those mx records are for this service. You may find your answers on this site:

https://documentation.n-able.com/mail-assure/userguide/Content/B_Admin Level/domains/mx-records.htm

Thank you so much. This was a big help. I will follow the records you referred, but do these settings generally look like pretty normal fare for an outside email provider request?

One last question - I had set up a Google Workspace with Squarespace for this domain when I first thought I would be providing the email. Do I need to delete those Google MX records before I add these? I hate to get rid of that account because I cannot get it back if the client changes their mind later and wants me to provide email handling. Thanks again.

Yes they look normal to me. You do need to delete the Google mx records but make a copy first just in case.

So I will still have my Google Workspace account, but I can delete the MX records and put them back in if I need to create email for this account? I really appreciate your quick response. 

Thank you so much.

Yes. As long as the workspace account stays active of course.