Emails sent to our domain fail due to SPF verification

Emails sent to our domain fail due to SPF verification

Hello ,

We are experiencing a problem with our domain . Most of our customers cannot send emails to us , the get below error
please advice its very critical

 

Delivery has failed to these recipients or groups:

jnxxxxx@telenet.co.ke
Your message wasn't delivered because the recipient's e-mail provider rejected it.

jxxxxxx@telenet.co.ke
Your message wasn't delivered because the recipient's e-mail provider rejected it.

The following organization rejected your message: mx.zoho.com.

Diagnostic information for administrators:

Generating server: AXIZJHBIMSVA01.AXIZ.COM

jnxxxx@telenet.co.ke
mx.zoho.com #<mx.zoho.com #5.7.23 smtp; 550 5.7.23 Sender's SPF Policy Failure> #SMTP#

jnxxxx@telenet.co.ke
mx.zoho.com #<mx.zoho.com #5.7.23 smtp; 550 5.7.23 Sender's SPF Policy Failure> #SMTP#