SMTP sending mail error

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[]
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[]
Apr 19 07:48:19 bitwarden postfix/smtpd[188087]: disconnect from unknown[] 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 =
mynetworks =, localhost,,
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

I could not understand what could be the problem ?

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…)

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

With Postfix, given the 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.