Direct Admin

Configuring DirectAdmin to use Mailbaby as a smarthost is straightforward. DirectAdmin uses include files within exim.conf, which allows you to easily extend your mail configuration without overwriting the core setup.

Note on DirectAdmin 1.702+: The configuration line condition = "${perl{check_limits}}" has been completely removed as of DirectAdmin version 1.702. If your server is running DA 1.702 or newer, please omit this line when configuring your routers in Step 3.

Step 1: Configure Authentication

First, create the file /etc/exim.authenticators.post.conf.

Add the following code, replacing YOURUSERNAME and YOURPASSWORD with your Mailbaby credentials. Your Mailbaby username is a single string and does not contain an @domain.com extension.

auth_login:
  driver = plaintext
  public_name = LOGIN
  hide client_send = : YOURUSERNAME : YOURPASSWORD

Step 2: Set Up Outbound Transports

Next, edit or create /etc/exim.transports.pre.conf and add the configuration below to handle outbound SMTP connections:

auth_relay:
  driver = smtp
  port = 25
  hosts_require_auth = $host_address
  hosts_require_tls = $host_address
  headers_add = "${if def:authenticated_id{X-AuthUser: ${authenticated_id}}}"
  interface = <; ${if exists{/etc/virtual/domainips}{${lookup{$sender_address_domain}lsearch*{/etc/virtual/domainips}}}}
  helo_data = ${if exists{/etc/virtual/helo_data}{${lookup{$sending_ip_address}iplsearch{/etc/virtual/helo_data}{$value}{$primary_hostname}}}{$primary_hostname}}
  hosts_try_chunking =
  hosts_try_fastopen =
.include_if_exists /etc/exim.dkim.conf

auth_relay_forward:
  driver = smtp
  port = 25
  hosts_require_auth = $host_address
  hosts_require_tls = $host_address
  headers_add = "${if def:authenticated_id{X-AuthUser: ${authenticated_id}}}"
  interface = <; ${if exists{/etc/virtual/domainips}{${lookup{$sender_address_domain}lsearch*{/etc/virtual/domainips}}}}
  helo_data = ${if exists{/etc/virtual/helo_data}{${lookup{$sending_ip_address}iplsearch{/etc/virtual/helo_data}{$value}{$primary_hostname}}}{$primary_hostname}}
  hosts_try_chunking =
  hosts_try_fastopen =
  max_rcpt = 1
  return_path = ${srs_encode {SRS_SECRET} {$return_path} {$original_domain}}
.include_if_exists /etc/exim.dkim.conf

Step 3: Configure the Routers

Create /etc/exim.routers.pre.conf to route outbound mail through the Mailbaby network. (Remember to remove the perl{check_limits} condition line shown below if you are on DirectAdmin 1.702 or later).

smart_route_forward:
  driver = manualroute
  domains = ! +local_domains
  ignore_target_hosts = 127.0.0.0/8
  condition = ${if !eq{$original_domain}{$domain}}
  condition = ${if !eq{$original_domain}{}}
  
  transport = auth_relay_forward

  route_list = * relay.mailbaby.net
  no_more

smart_route:
  driver = manualroute
  domains = ! +local_domains
  ignore_target_hosts = 127.0.0.0/8
  condition = "${perl{check_limits}}"

  transport = auth_relay

  route_list = * relay.mailbaby.net
  no_more