§2024-04-30
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SASL setup testing with telent, by chatGPT
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Ensure SASL is configured: Before using telnet to verify SASL setup, ensure that SASL is correctly configured on your Postfix server. This typically involves configuring
smtpd_sasl_auth_enable,smtpd_sasl_security_options, and other relevant parameters in your Postfix configuration.
- if
alexlai@h2Jammy:~$ grep smtpd_sasl_auth_enable /etc/postfix/main.cf
# smtpd_sasl_auth_enable = yes
alexlai@h2Jammy:~$ grep smtpd_sasl_security_options /etc/postfix/main.cf
smtpd_sasl_security_options = noanonymous,noplaintext
alexlai@opi58G:~/scripts$ telnet h2jammy.yushei.net 25
Trying 59.126.118.193...
Connected to h2jammy.yushei.net.
Escape character is '^]'.
220 h2jammy.yushei.net ESMTP Postfix (Ubuntu)
EHLO yushei.me
250-h2jammy.yushei.net
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-ENHANCEDSTATUSCODES
250-8BITMIME
250-DSN
250-SMTPUTF8
250 CHUNKING
AUTH PLAIN
503 5.5.1 Error: authentication not enabled
MAIL FROM: alexlai@yushei.me
250 2.1.0 Ok
RCPT TO: alexlai@h2jammy.yushei.net
250 2.1.5 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
Subject: testing # smtpd_sasl_auth_enable = yes
Time 2024-04-30 08:53
Hi
Bye
.
250 2.0.0 Ok: queued as F22304024BDBE
^K
502 5.5.2 Error: command not recognized
quit
221 2.0.0 Bye
Connection closed by foreign host.
alexlai@h2Jammy:~$ mail
"/home/alexlai/Maildir": 8 messages 2 new
1 Mail Delivery Syst 日 四 28 05: 100/4157 Undelivered Mail Returned to Sender
2 alexlai@h2Jammy.yu 日 四 28 06: 24/1167 *** SECURITY information for h2Jammy.yushei.net ***
3 Nextcloud 日 四 28 06: 346/15798 Email setting test
4 alexlai@h2jammy.yu 日 四 28 07: 15/596 testing h2jammy.yushei.net relay
5 Mail Delivery Syst 日 四 28 07: 89/3642 Undelivered Mail Returned to Sender
6 alexlai@h2jammy.yu 日 四 28 07: 24/1105 testing h2jammy.yushei.net relay
>N 7 Nextcloud 日 四 28 12: 346/15798 Email setting test
N 8 二 四 30 00: 12/498 testing # smtpd_sasl_auth_enable = yes
?
- if,
alexlai@h2Jammy:~$ grep smtpd_sasl /etc/postfix/main.cf
smtpd_sasl_path = private/auth
smtpd_sasl_local_domain =
# smtpd_sasl_security_options = noanonymous,noplaintext
smtpd_sasl_security_options = noanonymous
smtpd_sasl_tls_security_options = noanonymous
smtpd_sasl_auth_enable = yes