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...

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

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

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...

Validation (CSV) is a technical method of email authentication intended to fight spam. Its focus is the SMTP HELO-identity of mail transfer agents. CSV was...

Domain-based Message Authentication, Reporting and Conformance (DMARC) is an email authentication protocol. It is designed to give email domain owners...

belongs to the user's credentials, supplied for SMTP authentication. If the FROM field is forged, an SMTP error will be returned to the email client (e...

specified protocols such as: DNS failover, dynamic IP addresses, SMTP authentication, and GeoDNS. Public recursive name server "Designing DNS for Availability...

Response Authentication Mechanism (SCRAM) is a family of modern, password-based challenge–response authentication mechanisms providing authentication of a...

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

(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...

the SMTP protocol. The email client which uses the SMTP protocol creates an authentication extension, which the mail server uses to authenticate the sender...

"DovecotFeatures - Dovecot Wiki". wiki.dovecot.org. "Authentication - Dovecot Wiki". wiki.dovecot.org. "HSL - Halon SMTP server". Halon Security AB. Retrieved 2016-02-11...

email authentication method that ensures the sending mail server is authorized to originate mail from the email sender's domain. This authentication only...

email authentication systems to messages relayed. Data pertaining to the server's activity is also part of the header, as defined below. SMTP defines...

Remote Authentication Dial-In User Service (RADIUS) is a networking protocol that provides centralized authentication, authorization, and accounting (AAA)...

interesting features, such as IMAP, Transport Layer Security, or SMTP Authentication —in fact, an ISP can do without the latter, as it can recognize its...

secure channel. Note that authentication is optional in SMTP, and the omitted server reply may now safely advertise an AUTH PLAIN SMTP extension, which is not...

access authentication and Digest access authentication. 401 semantically means "unauthenticated", the user does not have valid authentication credentials...

(ODMR) is an SMTP extension standardized in RFC 2645 that allows e-mail to be relayed to the recipients after they have been authenticated. It uses the...

Simple Authentication and Security Layer (SASL) is a framework for authentication and data security in Internet protocols. It decouples authentication mechanisms...

files. Base64 is also widely used for sending e-mail attachments, because SMTP – in its original form – was designed to transport 7-bit ASCII characters...

Retrieved 2010-05-09. "MS02-011: An authentication flaw could allow unauthorized users to be authenticated on the SMTP service". Microsoft. 2007-03-29. Retrieved...

and forward to a qmail based message store. SMTP Authentication via LDAP, vpopmaild, flat_file, or SMTP proxy. Access control by domain, IP, sender,...

NAUTH Number of authentication methods supported, uint8 AUTH Authentication methods, 1 byte per method supported The authentication methods supported...

standards for email authentication in 2004. The name is an acronym of MTA Authorization Records In DNS. Lightweight MTA Authentication Protocol (LMAP) was...

Protocol (IP) networks. The protocol provides cryptographic authentication of data, authenticated denial of existence, and data integrity, but not availability...