Mail error, sending mails from mailgun

Mail error, sending mails from mailgun

Hi,

I configured my domain to use Zoho for emails, and MailGun for bulk emails with following TXT record: v=spf1 include:zoho.com include:mailgun.org ~all

When I send an email from my website using mail gun I am getting following error(s):

1. Will retry in 600 seconds: xxxx.xxxx@yahoo.com → xxxx@dxxxxxn.me 'Vendor enquiry' Server response: 452 452 Temporarily Deferred
2. Will retry in 900 seconds: xxxx.xxxx@yahoo.com → xxxx@dxxxxxn.me 'Vendor enquiry' Server response: 499 Unable to connect to MX servers: [mx.zoho.com mx2.zoho.com mx3.zoho.com]

What might be wrong here?