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https://en.wikipedia.org/wiki/Extended_SMTP
Extended SMTP (ESMTP), sometimes referred to as Enhanced SMTP, is a definition of protocol extensions to the Simple Mail Transfer Protocol (SMTP) standard. ESMTP was defined in November 1995 in IETF publication RFC 1869 which established a …
https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/214630-esmtp-commands-supported-by-the-esa-ces.html
Jul 16, 2019 · 220 C680.lab.test ESMTP EHLO test 250-C680.lab.test 250-8BITMIME 250 SIZE 10485760 help 214-The following commands are recognized 214- auth data ehlo helo 214- help mail noop quit 214 rcpt rset vrfy Related Information. Cisco Email Security Appliance - End-User Guides; Technical Support & Documentation - Cisco Systems
https://searchwindowsserver.techtarget.com/tutorial/Part-3-How-Extended-SMTP-works-and-common-ESMTP-commands
ESMTP is a version of the SMTP protocol that has been augmented to support additional commands. Although ESMTP is the chosen protocol for SMTP communications, ESMTP is not unique to Exchange. Windows 2000 Server and Windows Server 2003 both support the ESMTP protocol by default.
https://www.ibm.com/support/knowledgecenter/SSKTMJ_10.0.1/admin/conf_securingsmtpsessionsusingthestarttlsextension_c.html
Enabling ESMTP support for negotiated SSL allows a server to accept requests to use SSL over TCP/IP from remote servers that connect anonymously. However, not all inbound connections are anonymous. A connecting SMTP server may be configured to send Domino a name and password by means of the ESMTP AUTH command.
https://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/113423-asa-esmtp-smtp-inspection.html
Aug 07, 2017 · ESMTP and SMTP inspection enforce a policy that allows only certain commands through the ASA. If a mail command is sent that is not allowed, it is replaced by Xs, which makes the command invalid to the client and the server. Commands that are normally allowed are listed in the inspect esmtp section of the Cisco ASA Series Command Reference.
https://pepipost.com/blog/25-465-587-2525-choose-the-right-smtp-port/
Oct 10, 2019 · In fact, Port 587 is the one recommended for mail submissions instead of port 25 as per RFC 2476. But even if the mail server supports it, it may or may not be open for mail submissions. For that, you need to check with your administrator or with your hosting service provider. Because all larger hosting services do not support port 587.
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https://www.att.com/esupport/main.html#!/email-support
Find out how to set up and manage your AT&T email account. AT&T has you covered with AT&T Email Support support, troubleshooting, how-to articles, & videos.
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