CODEWITHSUNDEEP
emailsslsmtppostfix-mta
linux01
linux01

Reputation: 73

Unable to send email notifications from Unifi Controller to Postfix SMTP Relay

We are trying to send Email through UniFi Controller to Postfix SMTP Relay Server. Error messages at the SMTP End are:

Oct 1 16:39:10 localhost postfix/smtpd[16188]: SSL_accept error from unknown[192.168.0.1]: -1
Oct 1 16:39:10 localhost postfix/smtpd[16188]: warning: TLS library problem: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown:../ssl/record/rec_layer_s3.c:1544:SSL alert number 46:
Oct 1 16:39:10 localhost postfix/smtpd[16188]: lost connection after STARTTLS from unknown[192.168.0.1]
Oct 1 16:39:10 localhost postfix/smtpd[16188]: disconnect from unknown[192.168.0.1] ehlo=1 starttls=0/1 commands=1/2

And at the UniFi Controller End the Error Message is:

There was an error sending test mail to [email protected]. Failed to send email for unknown reasons.

We have not installed SSL Certs in Postfix SMTP relay. The SMTP Configuration is as mentioned below:

# postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
compatibility_level = 2
forward_path = /$home/.forward
inet_interfaces = all
inet_protocols = ipv4
mail_name = V1
mailbox_size_limit = 0
mydestination = localhost, localhost.$mydomain, $mydomain, $myhostname
mydomain = g1.test.com
myhostname = V1.test.com
mynetworks = /etc/postfix/relay_table
myorigin = /etc/mailname
notify_classes = delay,resource,software
readme_directory = no
recipient_delimiter = +
relayhost = smtp-relay.gmail.com:25
smtp_destination_concurrency_limit = 5
smtp_destination_rate_delay = 1s
smtp_extra_recipient_limit = 10
smtp_fallback_relay = 192.168.0.100
smtp_generic_maps = hash:/etc/postfix/generic
smtp_tls_session_cache_database = btree:/var/lib/postfix/smtp_tls_session_cache
smtpd_banner = $myhostname ESMTP $mail_name
smtpd_client_connection_count_limit = 10
smtpd_client_connection_rate_limit = 60
smtpd_discard_ehlo_keywords = silent-discard, dsn
smtpd_error_sleep_time = 1s
smtpd_hard_error_limit = 20
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination
smtpd_soft_error_limit = 10
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_loglevel = 1
smtpd_tls_protocols = !SSLv2, !SSLv3
smtpd_tls_session_cache_database = btree:/var/lib/postfix/smtpd_tls_session_cache
smtpd_use_tls = yes

We have not created files : smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key

We do not want to install SSL CA cert in the SMTP Relay.

Please help how can I fix this issue so that UniFi Controller cam send emails from SMTP Relay.

Upvotes: 1

Views: 4029

Answers (1)

Jon
Jon

Reputation: 61

I found that I have the same problem as well. I found this article https://help.ui.com/hc/en-us/articles/205202580-UniFi-Explaining-the-system-properties-File about manually editing the system.properties file. I added smtp.starttls_enabled=false to the file and restarted the unifi service and now test emails are delivered.

Upvotes: 2

Related Questions