using any authentication mechanism supported by the server. It is mainly used by submission servers, where authentication is mandatory. SMTP as specified...

outbound SMTP server. SMTP Authentication, often abbreviated SMTP AUTH, is an extension of the SMTP in order to log in using an authentication mechanism...

does not cover user authentication of email submission and retrieval. In the early 1980s, when Simple Mail Transfer Protocol (SMTP) was designed, it provided...

insufficient system storage 454 4.7.0 Temporary authentication failure 455 Server unable to accommodate parameters The SMTP client SHOULD NOT repeat the exact request...

It is intended to provide authentication of the communication partners, as well as data integrity and confidentiality. SMTPS is neither a proprietary protocol...

Protocol: Updates and Operational Guidance RFC 7672 SMTP Security via Opportunistic DNS-Based Authentication of Named Entities (DANE) Transport Layer Security...

POP before SMTP or SMTP after POP is a method of authentication used by mail server software which helps allow users the option to send e-mail from any...

(SASL), it is often used in email software as part of SMTP Authentication and for the authentication of POP and IMAP users, as well as in applications implementing...

server-to-server SMTP transfers, which is where spam is injected, require no authentication. Various methods have been discussed and implemented for SMTP tarpits...

Protocol (IP) networks. It supports network-level peer authentication, data origin authentication, data integrity, data confidentiality (encryption), and...