Mailercloud
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Mailercloud gives you a free tier that covers 1,000 subscribers and 12,000 emails per month, with no credit card required to get started. Paid plans begin at $7/month and include automation, AMP email support, and higher send volumes. Built in the UK, it focuses on accessibility for small businesses and solopreneurs who want professional email without the enterprise price tag.
It's ideal if you're testing email marketing or have a small subscriber base that doesn't justify premium pricing. The free tier is genuinely usable rather than a stripped-down teaser, and the jump to paid plans is gradual enough that you'll stay affordable as you grow to a few thousand contacts.