My accounts which I have had for years with you now are not getting through and are being blocked. Please help and fix

Many of my emails are bouncing back/blocked through my pc. And I cannot send emails with my samsung galaxy at all. My email account is info@crossoverautotransport.com and james@crossoverautotransport.com

Here is my computer error:

This message was created automatically by mail delivery software.

 

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

 

  jnealmccoy2399@gmail.com

    host gmail-smtp-in.l.google.com [172.253.122.26]

    SMTP error from remote mail server after end of data:

    550-5.7.26 This message does not pass authentication checks (SPF and DKIM both

    550-5.7.26 do not pass). SPF check for [crossoverautotransport.com] does not

    550-5.7.26 pass with ip: [66.96.184.1].To best protect our users from spam, the

    550-5.7.26 message has been blocked. Please visit

    550-5.7.26  https://support.google.com/mail/answer/81126#authentication for more

    550 5.7.26 information. e23-20020a2e9317000000b00290623f7756si4459557ljh.104 - gsmtp

And my cell error response message

This message was created automatically by mail delivery software.

 

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

 

  jlrandolph40@gmail.com

    host gmail-smtp-in.l.google.com [172.253.115.27]

    SMTP error from remote mail server after pipelined end of data:

    550-5.7.1 [66.96.184.7] Messages missing a valid messageId header are not

    550 5.7.1 accepted. v16-20020ac85790000000b003ab8d13c3a6si13299837qta.409 - gsmtp