Sending mail to domain that does not have mx record

What happens when you don’t have mx record in your dns server?

1) The request goes to dns server asking what is mx for example.com

2) Authoritative dns server answers:  I don’t have any mx records for example.com

3) Smtp protocol will send mail to example.com’s A record

So if domain does not have mx record mail goes to whatever A record is.

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