It's often handy to dump off email to the local MTA rather than talking SMTP to a remote host directly. It's quicker, and logging is far superior to what Ubersmith provides.

This style of configuration is confirmed to work with:

• Office 365 (364)
• Sendgrid
• Amazon SES

From a shell application,

Ubersmith Mail container for Ubersmith 4.x

Copy your cacert.pem and paste it in /usr/local/ubersmith/conf/mail:

• cd /usr/local/ubersmith/conf/mail; curl -L -O https://curl.haxx.se/ca/cacert.pem

 Go to the mail container:

• cd /usr/local/ubersmith; docker-compose exec mail bash

Modify /etc/postfix/main.cf to uncomment and edit the following variables to the appropriate settings:
/etc/postfix/main.cf Configuration Options

Create /etc/postfix/sasl_passwd and generate sasl_passwd.db:

• Edit /etc/postfix/sasl_passwd to contain the following:

  • [smtp.office365.com]:587    smtp-user@example.com:password

• Run:
  • postmap /etc/postfix/sasl_passwd
• Exit the container, and run:
  • docker cp ubersmith_mail_1:/etc/postfix/main.cf /usr/local/ubersmith/conf/mail

  • docker cp ubersmith_mail_1:/etc/postfix/sasl_passwd /usr/local/ubersmith/conf/mail

  • docker cp ubersmith_mail_1:/etc/postfix/sasl_passwd.db /usr/local/ubersmith/conf/mail

• Edit /usr/local/ubersmith/docker-compose.override.yml to add the following volumes to the mail service:

  - "/usr/local/ubersmith/conf/mail/cacert.pem:/etc/postfix/cacert.pem" - "/usr/local/ubersmith/conf/mail/main.cf:/etc/postfix/main.cf" - "/usr/local/ubersmith/conf/mail/sasl_passwd:/etc/postfix/sasl_passwd" - "/usr/local/ubersmith/conf/mail/sasl_passwd.db:/etc/postfix/sasl_passwd.db"

  
  

• Recreate the mail container:

  • cd /usr/local/ubersmith; docker-compose up -d mail

• Verify mail is flowing properly:

  • tail -f /var/log/ubersmith/mail/docker.log

Legacy Instructions for Ubersmith 3.x

These instructions also appear to work for relaying to Exim and postmarkapp.com.

This guide is functional on CentOS 6, which runs a pretty ancient version of Postfix – so it should hopefully also work with newer versions and OS'es.

• Install the cyrus-sasl-plain package (or equivalent for the OS in question):

  • yum install cyrus-sasl-plain

• Grab a copy of cacert.pem and drop it off in /etc/postfix

  • cd /etc/postfix; curl -L -O http://curl.haxx.se/ca/cacert.pem

• Edit /etc/postfix/main.cf and include/update the following configuration options:
  
  
  /etc/postfix/main.cf Configuration Options

  relayhost = [smtp.office365.com]:587 smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous smtp_sasl_tls_security_options = noanonymous   smtp_send_dummy_mail_auth = yes smtp_always_send_ehlo = yes smtp_tls_security_level = encrypt smtp_use_tls = yes smtp_tls_CAfile = /etc/postfix/cacert.pem   # debug options # debug_peer_list = smtp.office365.com

  
  

• Edit /etc/postfix/sasl_passwd to contain the following:

  • [smtp.office365.com]:587    smtp-user@example.com:password

• Run:

  • postmap /etc/postfix/sasl_passwd

• Restart Postfix:

  • service postfix restart

Related Topics 

Forwarding Emails