I am interested in purchasing a domain, say mydomain.net
My application, whose url I want to be mydomain.net, would send transactional email for authenticating new users. For this purpose I decided to choose Sendinblue.
I want the sender of my transactional emails be noreply@mydomain.net,
thus I will add a new domain at sendinblue and call it mydomain.net. Then I will add a new sender at Sendinblue and call it noreply@mydomain.net
Am I expected to add a MX record at my hosting provider (and also name registrar) to set the mail delivery destination towards Sendinblue?
The MX records are used to receive mails only. Since you will be sending from Sendinblue and you will not receive answers to noreply@mydomain.net you do not need to create MX record for this.