New registartion emails are being sent from personal Gmail address

At some point in past I must have done some settings accidentally that all ‘new registration’ emails from my BuddyPress site are sent from my personal Gmail address.

I have no idea where is the system picking up this email address from. Can somebody kindly help me know the possible locations and remove this email address?

I have already checked all the basic locations and could not locate this email address.

Also, in the settings here – https://mysite.com/wp-admin/network/settings I have set up following message –

Dear User,

Your new mysite.com account is set up.

You can log in with the following information:
Username: USERNAME
Password: PASSWORD
LOGINLINK

Thanks!

–The Team @ SITE_NAME

However, what my users are receiving is this –

Thanks for registering! To complete the activation of your account please click the following link:

https://mysite.com/activate/?key=some-key-here

Thanks for any help on this.