Im having trouble installing SMTH Auth for my ubuntu email server. I have followed ubuntu own guide for SMTH AUT (https://help.ubuntu.com/14.04/serverguide/postfix.html).

But my email client thunderbird is giving this error " lost connection to SMTP-client 127.0.0.1." I cant add new users to thundbird either because of this connection problem. Do i have to alter any setting on my Thunderbird perhaps since ? I did try to make thunderbird use SSL for imap as well but that neither works.

I restarted postfix and dovecot to find errors but both run just fine. Prior to SMTP auth changes thunderbird could connect just fine to my server and send mails.

This is my main.cf file in postfix.

It looks just like the one on ubuntu guide above.

readme_directory = no
# TLS parameters
#smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

myhostname = mail.mysite.com
mydomain = mysite.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = $mydomain
mydestination = mysite.com
#relayhost = smtp.192.168.10.1.com
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 192.168.10.0/24
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
home_mailbox = Maildir/
mailbox_command =

#SMTP AUTH
smtpd_sasl_type = dovecot
smtpd_recipient_restrictions=permit_mynetworks,
permit_sasl_authenticated,reject_unauth_destination
smtpd_sasl_local_domain =
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_tls_auth_only = no
smtp_tls_security_level = may
smtpd_tls_security_level = may
smtp_tls_note_starttls_offer = yes
smtpd_tls_key_file = /etc/ssl/private/smtpd.key
smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt
smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes

This my dovecot configuration at 10-master.conf

 service imap-login {
inet_listener imap {
#port = 143
}
 inet_listener imaps {
#port = 993
#ssl = yes
}

# Number of connections to handle before starting a new process. Typically
# the only useful values are 0 (unlimited) or 1. 1 is more secure, but 0
# is faster. <doc/wiki/LoginProcess.txt>
#service_count = 1

# Number of processes to always keep waiting for more connections.
#process_min_avail = 0

# If you set service_count=0, you probably need to grow this.
#vsz_limit = $default_vsz_limit
}

service pop3-login {
inet_listener pop3 {
#port = 110
 }
inet_listener pop3s {
#port = 995
#ssl = yes
 }
 }
 service lmtp {
unix_listener lmtp {
#mode = 0666
}

# Create inet listener only if you can't use the above UNIX socket
 #inet_listener lmtp {
# Avoid making LMTP visible for the entire internet
#address =
#port =
#}
}

 service imap {
 # Most of the memory goes to mmap()ing files. You may need to increase this
# limit if you have huge mailboxes.
#vsz_limit = $default_vsz_limit

 # Max. number of IMAP processes (connections)
#process_limit = 1024
 }

service pop3 {
# Max. number of POP3 processes (connections)
#process_limit = 1024
}


service auth {

unix_listener auth-userdb {
#mode = 0600
#user =
#group =
}

# Postfix smtp-auth
unix_listener /var/spool/postfix/private/auth {
mode = 0660
user = postfix
}

}

service dict {
# If dict proxy is used, mail processes should have access to its socket.
# For example: mode=0660, group=vmail and global mail_access_groups=vmail
unix_listener dict {
 #mode = 0600
 #user =
 #group =
 }
 }

I did add auth_mechanisms = plain login to 10-auth.conf as well.