SendInBlue 9,000 emails per month (daily limit of 300) for an unlimited number of subscribers. You can have a maximum of 2,000 subscribers in your automated campaigns at any time. A good range of advanced autoresponders is offered on the free plan, including welcome, anniversary, page visits and ecommerce (such as product purchase or abandoned cart). You also get an allowance for free transactional emails. SMS can also be added for an extra cost. (Full review)
A lead magnet (a.k.a. an optin bribe) is something amazing that you give away for free in exchange for an email address. This doesn’t have to cost you anything to create; most lead magnets are digital materials like PDFs, MP3 audio files, or videos that you can create yourself at minimal or no cost. It can be absolutely anything you want, so long as it provides value to your visitors for free.