: MX Record propogation time - Email working sometimes and sometimes not I have tried to migrate my hosting from Hostgator to AWS yesterday. I have removed the DNS of HostGator and made it to

@Berumen354

When changing DNS providers it is very important to be careful to duplicate the zone file between the providers and to keep it online at the old provider for at least 48-72 hours before terminating it to ensure globally all DNS queries are being sent to the new DNS provider. In your example what it sounds like is that when you added the A record for the AWS public IP to your zone file with your registrar you didn't add the relevant MX records. What you need to do is log into your HostGator control panel. open the DNS advanced editor which will show you every single entry in your zone file. What you then want to do is duplicate them all from the HostGator settings into your registrar's DNS control panel. In particular make sure that any TXT and MX records are duplicated precisely.

In order to make it easier rather than trying to identify which records to duplicate the best rule of thumb is to duplicate every single record except for the SOA record. The SOA record will be different on the new DNS server and should have been set up by your provider already but all the other records should be duplicated precisely. Once you have done that keep the old records on the HostGator account for at least 72 hours. Once that time has gone through all DNS queries should not be going through the new DNS server and you can shut down your old hosting account.

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