It’s up to you and your provider. If you are using Google, you can send 300 identical emails/day without being banned.
But we’ll recommend you use spins and variables to personalize at the scale of your email
We do Sales Automation, which means we automate directly from your professional email.
This has the advantage of being much more deliverable (+70-80% open rate) since you're not identified as sending from a marketing inbox, so you don't end up in the Promotions boxes.
The disadvantage is that you're limited in volume - around 300 / day max (depending on your provider).
Unlike Marketing Automation, which uses a marketing domain rather than your business domain to send emails.
The advantage is that there is no theoretical limit on the number of emails that can be sent.
The disadvantage is that the email in question is easily identified as marketing and will very often end up in the Promotion inbox. The average open rate on this will be 10-15%... Max 30-35% if you have a good brand
This is very useful for newsletters, notifications, etc... Where you don't need volume constraints, but it's very bad for prospecting, since most of the emails won't be read.