I have tried to migrate my hosting from Hostgator to AWS yesterday. I have removed the DNS of HostGator and made it to the default of the service provider from whom i bought the domain and created A record to point to AWS public IP. After some time I realized it broke the MX record and I have reverted back the DNS settings to Hostgator itself. I'm using Gmail for business and the HostGator MX records point to Gmail.
I wasn't getting emails initially for 6 hours. and then It started working for few services like yahoo and gmail but the emails between the team itself wasn't working. All the email communications started working fine after sometime. Now again we are facing issues with the team emails. We are geting the email bounce reply.
Please let me know if i have missed something. Will the issue persist till the propagation time. My doubt is why it's working for sometime and again it starts failing. Its already around 18 hours since i updated the dns.