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email - What's different between "250-AUTH LOGIN …

    https://stackoverflow.com/questions/42852748/whats-different-between-250-auth-login-plain-and-250-auth-login-plain
    Mar 17, 2017 · The first one, 250-AUTH LOGIN PLAIN, is the modern RFC-compliant way for a mail server to announce what authentication methods it supports. Authenticated SMTP is used to allow valid remote users to send mail through an SMTP server while still preventing spammers from connecting and using it as a relay.
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    https://stackoverflow.com/questions/42852748/whats-different-between-250-auth-login-plain-and-250-auth-login-plain

AUTH Command and its Mechanisms (PLAIN, LOGIN, CRAM-MD5 ...

    https://www.samlogic.net/articles/smtp-commands-reference-auth.htm
    AUTH PLAIN One common method to login to an SMTP server is to use the PLAIN mechanism. The example below shows how AUTH PLAIN can be used to login: S: 220 smtp.server.com Simple Mail Transfer Service Ready C: EHLO client.example.com S: 250-smtp.server.com Hello client.example.com S: 250-SIZE 1000000 S: 250 AUTH LOGIN PLAIN CRAM-MD5 C: AUTH PLAIN
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    https://www.samlogic.net/articles/smtp-commands-reference-auth.htm

What is the difference between using `:plain` vs `:login ...

    https://stackoverflow.com/questions/59464979/what-is-the-difference-between-using-plain-vs-login-in-active-mailer-smtp
    Dec 24, 2019 · According to ActionMailer documentation here irrespective of authentication :plain or :login the password is always Base64 encoded. The problem with Base64 encoding is that it can be easily decoded by anybody eavesdropping in on the SMTP communication. So both of these authentication mechanisms are really the same in terms of security.
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    https://stackoverflow.com/questions/59464979/what-is-the-difference-between-using-plain-vs-login-in-active-mailer-smtp

How to Test SMTP AUTH using Telnet - NDCHost

    https://www.ndchost.com/wiki/mail/test-smtp-auth-telnet
    Jan 04, 2017 · EHLO exampledomain.com 250-server1.exampledomain.com Hello [1.1.1.2] 250-SIZE 52428800 250-PIPELINING 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP AUTH LOGIN 334 VXNlcm5hbWU6 dXNlcm5hbWUuY29t 334 UGFzc3dvcmQ6 bXlwYXNzd29yZA== 235 Authentication succeeded
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    https://www.ndchost.com/wiki/mail/test-smtp-auth-telnet

Auth Settings — Dovecot documentation

    https://doc.dovecot.org/configuration_manual/authentication/auth_settings/
    auth_mechanisms = plain login Enables the PLAIN and LOGIN authentication mechanisms. The LOGIN mechanism is obsolete, but still used by old Outlooks and some Microsoft phones. auth_verbose = yes Log a line for each authentication attempt failure. auth_verbose_passwords = sha1:6
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    https://doc.dovecot.org/configuration_manual/authentication/auth_settings/

AUTH PLAIN LOGIN - SMTP Relay not working | MailWizz ...

    https://forum.mailwizz.com/threads/auth-plain-login-smtp-relay-not-working.756/
    9.38.0.428-0 2017-05-10T18:26:59.704+03:00 Connecting to: domain.zz:2525 Enc: No Login: domain.zz-vmta Connected. 220 domain.zz ESMTP service ready EHLO 1.1.1.1 250-domain.zz says hello 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-CHUNKING 250-8BITMIME 250-AUTH CRAM-MD5 PLAIN LOGIN 250-AUTH=CRAM-MD5 PLAIN LOGIN 250-XACK 250-SIZE 0 250-VERP 250 DSN AUTH LOGIN MTE2c2hrb2xhLnJ1LXZtdGE= 334 ...
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    https://forum.mailwizz.com/threads/auth-plain-login-smtp-relay-not-working.756/

How to enable user authentication for a Postfix SMTP ...

    https://www.xmodulo.com/enable-user-authentication-postfix-smtp-server-sasl.html
    Nov 25, 2020 · ehlo mail.example.tst 250- mail.example.tst 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH PLAIN LOGIN 250-AUTH=PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN . Amongst other features that the SMTP server advertises, the STARTTLS and AUTH features should be available.
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    https://www.xmodulo.com/enable-user-authentication-postfix-smtp-server-sasl.html

"250-AUTH PLAIN LOGIN" instead of "250-AUTH LOGIN PLAIN ...

    https://www.howtoforge.com/community/threads/250-auth-plain-login-instead-of-250-auth-login-plain.23417/
    The order doesn't matter at all, so you can ignore this. May 19, 2008 #2 omichaelshar New Member I have been following the same tutorial and "ehlo local host" produces the following output: 250-AUTH PLAIN LOGIN CRAM-MD5 NTLM DIGEST-MD5 250-AUTH=PLAIN LOGIN CRAM-MD5 NTLM DIGEST-MD5 Is this an issue? If so, how can I fix it?
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    https://www.howtoforge.com/community/threads/250-auth-plain-login-instead-of-250-auth-login-plain.23417/

How to Handle SMTP Authentication | Mailtrap Blog

    https://mailtrap.io/blog/smtp-auth/
    Aug 26, 2019 · S: 250 AUTH LOGIN PLAIN CRAM-MD5 C: AUTH PLAIN vHRjyADROPsdSDIROu= S: 235 Authentication successful LOGIN – the server requests the client to authorize using the username and password. The difference from PLAIN is that the credentials encoded in Base64 are transmitted one by one – username and password.
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    https://mailtrap.io/blog/smtp-auth/

How to test SMTP Authentication and StartTLS - …

    https://www.saotn.org/test-smtp-authentication-starttls/
    EHLO there 250-smtp.example.com 250-PIPELINING 250-SIZE 52428800 250-ETRN 250-AUTH PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN. Here you notice AUTH PLAIN LOGIN as a log-in method. The SMTP mail server supports the authentication mechanism you want.
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    https://www.saotn.org/test-smtp-authentication-starttls/

Troubleshooting SMTP Auth Login Telnet | Exchange Server ...

    https://www.computerperformance.co.uk/exchange-2010/smtp-auth-login/
    3) SMTP Auth Login Plain. Our mission is to login to our mailbox on the Exchange 2010 server. Issue the following SMTP command in telnet: Auth Login (Where Auth means authenticate). Naturally, you must know your mailbox name and its email address. This must be your email domain, not your Active Directory domain.
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    https://www.computerperformance.co.uk/exchange-2010/smtp-auth-login/

SMTP AUTH: SMTP authentication | the right protocol ...

    https://www.ionos.com/digitalguide/e-mail/technical-matters/smtp-auth/
    The server will offer a selection of authentication mechanisms as shown in the example above where you can select, for example, LOGIN by entering the command “ AUTH LOGIN ” Now comes the actual test: after the commands ‘ MAIL FROM ’ and ‘ RCPT TO ’, enter a made-up sender and recipient address, i.e. one that does not exist.
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    https://www.ionos.com/digitalguide/e-mail/technical-matters/smtp-auth/

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