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Approval process - email response not working

I have set an approval process on quote.
Manual approval and rejection is working fine but approve/reject through email is not working.
below configurations are set up in our org :

1: Under Setup > Workflow and Approval process > Process Automation Settings > enabled email approval response
2: Created an Organization-Wide Email Address and using that as 'from address' in initial submission email alert action
3: Not using gmail addresses anywhere
4: I am replying to the same email for approval or rejection
5: Using the proper words like 'approve' / 'reject' / 'approved' .... as first line of the reply email body
6: Testing in sandbox

and still the record is not getting approved/rejected. Please let me know if anything is going wrong.

One more thing I have obsorved is
1: If the email address and from email address is same domain (e.g , ) then the email itself is not firing.
2: If  receiver email address and 'From' email address are different atleast the email is sending to approver but record is not getting approved or rejected through email

Thanks in advance