Most WordPress sites send fewer than a few hundred emails a month — password resets, contact-form confirmations, WooCommerce order receipts. At that volume, a free SMTP tier from a dedicated email provider is a better option than the host’s built-in mail() function (which often lands in spam or doesn’t work at all).
The providers below all offer a free tier with enough capacity for a low-traffic WordPress site’s transactional email. The limits, features, and longevity of free tiers vary — some are generous indefinitely, others are 30-day trials with a free-tier label. Each listing notes the current free-tier allowance and what happens when you exceed it.
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