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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.
The AUTH Command The AUTH command is an ESMTP command (SMTP service extension) that is used to authenticate the client to the server. The AUTH command sends the clients username and password to the e-mail server. AUTH can be combined with some other keywords as PLAIN LOGIN CRAM-MD5 and DIGEST-MD5 (e.g. AUTH LOGIN) to choose an authentication mechanism.
"250-AUTH PLAIN LOGIN" instead of "250-AUTH LOGIN PLAIN" as is listed in the Howto. First question is of course; Why did this happen / what caused this? Second question is; how will this affect my Postfix server's functionality or will it? I copied and pasted the commands into my SSH session so I know the commands were typed verbatim.
250-127...1 250-8bitmime 250-pipelining 250-chunking 250-dsn 250-enhancedstatuscodes 250-expn 250-help 250-xadr 250-xsta 250-xcir 250-xgen 250-starttls 250-auth plain login 250-auth=login plain 250-etrn 250-no-soliciting 250 size 0
S: 250 AUTH LOGIN PLAIN CRAM-MD5 C: AUTH LOGIN S: 334 DYT3jf4sdDR5 C: TXktVXNlcm5hbWU= S: 334 LIRdf2pekwW3 C: TXktUGFzc3dvcmQ= S: 235 Authentication successful DYT3jf4sdDR5 and LIRdf2pekwW3 by the server are the BASE64 encoded texts for "Username" and "Password" respectively.
Connected to localhost. Escape character is '^]'. 220 localhost ESMTP service ready ehlo localhost 250-localhost 250-STARTTLS 250-AUTH PLAIN LOGIN 250-PIPELINING 250 8BITMIME auth login bXl1c2VybmFtZQ 334 UGFzc3dvcmQ6 bXlwYXNzd29yZA 500 Unrecognized command My question is - am I able to send AUTH LOGIN user_name command and
220 mail.pahlevanzadeh.info ESMTP Postfix AND WHEN I USE EHLO COMMAND I GET THE FOLLOWING RESULT: ehlo localhost 250-mail.pahlevanzadeh.infousing 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN But i don't see two following lines in above: 250-AUTH LOGIN PLAIN 250-AUTH=LOGIN PLAIN
EHLO exampledomain.com 250-server1.exampledomain.com Hello [18.104.22.168] 250-SIZE 52428800 250-PIPELINING 250-AUTH PLAIN LOGIN 250-STARTTLS 250 HELP AUTH LOGIN 334 VXNlcm5hbWU6 dXNlcm5hbWUuY29t 334 UGFzc3dvcmQ6 bXlwYXNzd29yZA== 235 Authentication succeeded
C: EHLO client.example.com S: 250-smtp.example.com Hello client.example.com S: 250 AUTH GSSAPI DIGEST-MD5 PLAIN C: AUTH PLAIN dGVzdAB0ZXN0ADEyMzQ= S: 235 2.7.0 Authentication successful SMTP AUTH can be used also on port 25. Usually servers reject RCPT TO commands that imply relaying unless authentication credentials have been accepted.
I have reset passwords enabled 2 factor authentication deleted account and added back. This only happens for one GMAIL account. Another account is fine. ... 250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH. 250-ENHANCEDSTATUSCODES. 250-PIPELINING. 250-CHUNKING.