https://pike.lysator.liu.se/docs/ietf/rfc/14/rfc1425.xml
RFC 1425: SMTP Service Extensions - Pike Programming Language
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https://pike.lysator.liu.se/docs/ietf/rfc/16/rfc1652.xml
RFC 1652: SMTP Service Extension for 8bit-MIMEtransport - Pike Programming Language
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https://pike.lysator.liu.se/docs/ietf/rfc/18/rfc1870.xml
RFC 1870: SMTP Service Extension for Message Size Declaration - Pike Programming Language
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https://nyc.tunstun.org/info/rfc1869/
RFC 1869: SMTP Service Extensions | RFC Editor
Nov 1, 1995 - This memo defines a framework for extending the SMTP service by defining a means whereby a server SMTP can inform a client SMTP as to the service extensions it...
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https://sendvrel.kystron.com/documentation
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https://sendrix.io/
Sendrix — Boutique SMTP Service
Sendrix is a boutique SMTP delivery service with dedicated IP pools, reputation management, and warm-up assistance.
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https://statuscodefyi.com/hi/specs/rfc-3207/
RFC 3207 — SMTP Service Extension for Secure SMTP over Transport Layer Security — StatusCodeFYI
RFC 3207 defines STARTTLS for SMTP, enabling plaintext connections to upgrade to TLS encryption in-band. Essential for secure email relay configuration.
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https://sendvrel.kystron.com/status
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Elite Brevo and SendGrid alternative. Enterprise-grade transactional email infrastructure with sub-5ms delivery, automated SPF/DKIM/DMARC, and real-time inbox...
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https://stratcom.training/2025/08/09/mailtrap-smtp-service-a-marketers-guide-to-effective-email-campaigns/
Mailtrap SMTP service: A marketer’s guide to effective email campaigns – stratcom.training
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https://pike.roxen.org/docs/ietf/rfc/18/rfc1869.xml
RFC 1869: SMTP Service Extensions - Pike Programming Language
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