7

On a server I run both docker images and a postfix smtp server. The smtp server is accesible via localhost and is not installed in any sort of container.

The problem is that I can send email via terminal using sendemail outside of any container but I cannot send email via terminal running sendemail inside of any container.

The postfix configuration is the following:

# See /usr/share/postfix/main.cf.dist for a commented, more complete version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS parameters
smtpd_tls_cert_file=/etc/letsencrypt/live/ellak.org/fullchain.pem
smtpd_tls_key_file= /etc/letsencrypt/live/ellak.org/privkey.pem

smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = guest8.ellak.gr
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = mail.ellak.org, guest8.ellak.gr, localhost.ellak.gr, localhost

#Virtual alias domains
virtual_alias_domains = ellak.org

# RELAY Options
relayhost = [mail1.ellak.gr]:587
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

smtp_use_tls = yes
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
local_recipient_maps = proxy:unix:passwd.byname $alias_maps
smtp_tls_note_starttls_offer = yes


#Network Access Options

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 172.17.0.0/16
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
relay_domains = *

Inside the container I run:

sendemail -s 172.17.0.1:25 -f no-reply@ellak.org -t katanophoros@gmail.com -u Hello -m Hello

And outputs the following error:

Nov 27 19:51:14 7e56b4e22e09 sendemail[1988]: WARNING => The recipient <katanophoros@gmail.com> was rejected by the mail server, error follows:
Nov 27 19:51:14 7e56b4e22e09 sendemail[1988]: WARNING => Received:  454 4.7.1 <katanophoros@gmail.com>: Relay access denied
Nov 27 19:51:14 7e56b4e22e09 sendemail[1988]: ERROR => Exiting. No recipients were accepted for delivery by the mail server.

On the postfix logs I get are:

Nov 27 21:42:54 guest8 postfix/smtpd[14979]: NOQUEUE: reject: RCPT from unknown[172.18.0.5]: 454 4.7.1 <katanophoros@gmail.com>: Relay access denied; from=<no-reply@ellak.org> to=<katanophoros@gmail.com> proto=ESMTP helo=<7e56b4e22e09>
Nov 27 21:42:54 guest8 postfix/smtpd[14979]: lost connection after RCPT from unknown[172.18.0.5]
Nov 27 21:42:54 guest8 postfix/smtpd[14979]: disconnect from unknown[172.18.0.5]
Nov 27 21:46:14 guest8 postfix/anvil[14982]: statistics: max connection rate 2/60s for (smtp:172.18.0.5) at Nov 27 21:42:54
Nov 27 21:46:14 guest8 postfix/anvil[14982]: statistics: max connection count 1 for (smtp:172.18.0.5) at Nov 27 21:42:41
Nov 27 21:46:14 guest8 postfix/anvil[14982]: statistics: max cache size 1 at Nov 27 21:42:41

Do you have any sort of Idea how I will send emails inside docker containers?

8

172.18.0.5 is not included in mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 172.17.0.0/16

mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 172.16.0.0/12

this includes all private 172.16 subnets.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.