I have a Salesforce org. Email address in Org is email@example.com and domain is a company name hosted on gmail.
When I try to send email(Using apex or standard "Send email" button from objects) to any of the email address of same domain, salesforce shows that email is sent successfully but email is not recieved to recipients. If I send email to gmail hosted email address like firstname.lastname@example.org, it works fine. Emails are recived by recipients.
I have also tested the "Test Deliverability" process in salesforce, same happens here.
Then I chnage my email address from email@example.com tpo firstname.lastname@example.org. It is working fine now. All emails are recived by recipients.
How I use the email@example.com email address in salesforce org and send email successfully(firstname.lastname@example.org is valid email address)?
Is there any setting which I need to check or set?