I agree with David. Purchased records typically are poor quality, old and full of spam traps so it's not recommended to send email campaigns to these records through your own email account as it can have a negative effect on your deliverability, and therefore put any other campaigns you have running at risk.

Plus there is always the question of exactly what permissions these people gave when handing over their email address. You'd want to be absolutely sure the appropriate permissions are in place - if not then your brand could be put at risk.

There are companies who will allow you to buy advertising space in their email campaigns, that might be a better route if you don't have your own list yet but it's always best to start collecting email addresses yourself as soon as possible. Organic data will outperform purchased data every time.