Let's say that you have a very large marketing list with 200k people, but you only email once per month.

MailChimp = $1,190 per month if sent as marketing email priced on number of contacts, $200 per month if sent as transactional email priced as number of emails

SendGrid = $90 per month priced as number of emails

Just using ListMonk with SendGrid if you have a large number of subscribers would be worth it.

ListMonk represents the solution to mailing list management, IP reputation is a separate problem.

For things like charities that have tight budgets and potentially huge contact lists, ListMonk would really help them embrace email more because the pricing wouldn't put them off.