https://postmansmtp.com/
Post SMTP is the most powerful SMTP Mailing plugin for its users that maximizes the deliverability of emails generated by WordPress sites.
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https://sendpulse.com/features/smtp
Dec 10, 2024 - Send up to 12,000 emails a month for free through our SMTP or API. Use a dedicated IP-address, SPF and DKIM records, and track delivery error reports!
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https://e-mail-server.software.informer.com/
E-Mail Server (SMTPServerGUI.exe). Robust and secure SMTP/POP3 server. Easy to set up and very intuitive to use. Lots of security and anti spam features.
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https://www.proofpoint.com/us/products/email-security-and-protection/secure-email-relay
Secure transactional email with Proofpoint Secure Email Relay service. Migrate on-prem to cloud, centralize SMTP control, protect domains, and accelerate DMARC...
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