Mailrelay
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Mailrelay's editor is a fairly standard drag-and-drop builder, but the free plan around it is the real story: automation flows, A/B testing, and even phone support are available without upgrading, which is unusual generosity for a free tier anywhere in this category. Support is genuinely reachable by email, chat, or phone even for non-paying accounts.
The free plan never expires as long as the account stays active, and needs no credit card to activate, covering up to 20,000 subscribers and 80,000 emails sent per month. Paid plans begin at €48 a month for the Standard tier once a list or send volume exceeds those limits, rising to €67 for Enterprise. It's a strong option for a business or nonprofit with a sizeable list that doesn't send constantly, since the free ceiling covers volume most small organizations won't hit in a typical month.