MailboxWatch

MailboxWatch is an independent price tracker for cold email infrastructure. It compares 20 mailbox and SMTP offerings from 17 providers on one apples-to-apples setup: 30 mailboxes on 10 domains, monthly billing, domain costs included. Prices come from each provider's own pricing page, are re-checked regularly, and every change is logged. Free to use, with a weekly price-change email.