I added some custom field email_bcc on mail template model and also on the mail_mail model to accept the email_bcc data. And also did the appropriate changes on send_mail, generate_email functions to add the email_bcc field.
While I am sending email its success and email bcc is added to the email. Problem is the recipients under Bcc is shown to all, while sending from odoo.
I set the outgoing mail server with a Gmail account. So can from Odoo, we need to do anything extra or is it related to the mail server?
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That's good, yes i have noticed it's too old post having 500 views without any answer. that's why i have replied, so it may help someone else who is facing similar issue.