For an effective cold email campaign, using a number of  Google Workspace Accounts (formerly G Suite)  can be a solid choice. They offer a user-friendly interface and is generally considered easy to set up and manage. 

Another choice is Office 365 for the same purpose.

Next, it is best to link your Workspace or 365 accounts to this platform:

Instantly

Instantly allows you to create multiple email boxes and then to “warm them  up” for better inbox delivery, avoiding spam filters. They also provide data on open rates, clicks throughs and bounces.

This service offer excellent support and a generous Free Trial period to get you started.

If you find  setting up Google Workspace Accounts and linking them to these platforms is time-consuming and somewhat complicated, we recommend using Lead Gen, which will set the whole system up for a very reasonable fee, providing you with a turnkey system

Other Email Delivery Services, such as Constant Contact, SendinBlue, MailChimp, Brevo, SendGrid, AWeber, Vertical Response, and others, are not recomended as they will often restrict the sending of non-transactional email messages.