Question: what is The Secure SMTP ( SSMTP ) protocol for encrypted communications, as defined in RFC 2 4 8 7 , using STARTTLS. Mail user

what is The Secure SMTP (SSMTP) protocol for encrypted communications, as defined in RFC 2487, using STARTTLS. Mail user agents (MUAs) use TCP port 587 for email submission. STARTTLS can also be used over TCP port 25 in some implementations.

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