SMTP sending mail error

Help
1

I have set up a postfix for sending mails but i am facing an error
“Error sending SMTP test email
SMTP Client error: internal client error: No compatible authentication mechanism was found”

and in mail logs : -
Apr 19 07:48:19 bitwarden postfix/smtpd[188087]: connect from unknown[172.17.0.2]
Apr 19 07:48:19 bitwarden postfix/smtpd[188087]: discarding EHLO keywords: CHUNKING
Apr 19 07:48:19 bitwarden postfix/smtpd[188087]: lost connection after EHLO from unknown[172.17.0.2]
Apr 19 07:48:19 bitwarden postfix/smtpd[188087]: disconnect from unknown[172.17.0.2] ehlo=1 commands=1

Postfix configuration:

postconf -n

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
compatibility_level = 2
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5
html_directory = no
inet_interfaces = all
inet_protocols = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
meta_directory = /etc/postfix
mydestination = localhost.localdomain, localdomain, localhost, localhost.localdomain, localhost
myhostname = bitwarden.mydomain.com
mynetworks = 127.0.0.0/8, localhost, 172.17.0.0/16, 172.17.0.2
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix/README_FILES
relayhost =
sample_directory = /usr/share/doc/postfix/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
shlib_directory = /usr/lib64/postfix
smtp_tls_CApath = /etc/pki/tls/certs
smtp_tls_security_level = none
smtpd_tls_cert_file = /etc/pki/tls/certs/postfix.pem
smtpd_tls_key_file = /etc/pki/tls/private/postfix.key
smtpd_tls_security_level = none
unknown_local_recipient_reject_code = 550

SMTPVaultwarden
SMTPVaultwarden1264×836 63.1 KB

I could not understand what could be the problem ?

2

You probably want to use port 587 (submission) instead of 25.
(and perhaps you may want to reconsider whether you really want to run your own SMTP server…)

3

Are you trying to smtp forward through gmail’s smtp server’s or another service?

4

With Postfix, given the 127.0.0.0/8 CIDR and no relayhost set I would presume that the OP here is attempting to set up send from SMTP directly.

Assuming MX records are set correctly, but past that I dare not touch running a mail server.
As @reinob puts it its really not worth the hassle imo.