I am selling my business and the buyer is requesting my gmail address.
How can I safely transfer it to the buyer, and delete all of the emails I have
previously sent and received?
Thanks!
While there is no way to official way transfer your Gmail address all you would have to do is clear out all your emails, dump all your Google preferences, and search history if applicable and give him the password. From there he can login to your account and change the password so the account becomes his.
Do you have any other services associated with the Gmail address?
They'd also have access to your Adsense, Adwords, Analytics, your Google Chat, etc.
Double check that it makes sense to turn over the account.
There is no reason you can't forward the mails from your account to their own account for some time to cover business needs as an alternative to handing over the account permanently.