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Amazon SESIAM credentials, 19 regional endpoints, $0.10 per 1,000 emails. Lowest-cost transactional transport at volume.

Brevo (Sendinblue)API key authentication, a generous free tier, and a platform that handles both transactional and marketing email.

Gmail / Google WorkspaceConnect via OAuth 2.0. No app passwords, no 2FA workarounds — secure tokens that refresh themselves.

Microsoft 365 / OutlookConnect your Microsoft 365 account via OAuth 2.0 and send WordPress emails through Outlook or Office 365.

ResendModern transactional API with a clean dashboard. Sandbox keys, instant verification, and DKIM that just works.

SendLayerBuilt exclusively for transactional email. No marketing features — just delivery infrastructure for messages that must land.

Standard SMTPHost, port, encryption, optional authentication. If it speaks SMTP, NimblyMail connects to it.

ZeptoMailZoho's transactional email API with five regional endpoints. Natural fit if your stack already includes Zoho One.

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Background Email QueueNon-blocking sends with HIGH/NORMAL/BULK priorities Backup Mailer FailoverAutomatic retry through a backup provider Deliverability AuditsSPF, DKIM, DMARC, PTR, connectivity, queue health Developer SandboxLog Only mode for CI. Redirect mode for staging. Email LoggingEvery send captured. Resend in one click. Email Notification ControlsSilence noisy WordPress emails. Keep transactional mail. Failure AlertsAlerts that reach you even when the transport is down Multisite & Network AdminNetwork-wide defaults. Per-site overrides. Field locks.

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