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How to Set Up a Remote SMTP Server

Overview

In this article, we will explore how to set up a Smarthost SMTP relay with Webuzo. Here, we’ll demonstrate the configuration using the SMTP2GO relay host as an example. However, you can adapt these steps to set up any SMTP relay by referring to the provided example.

Set Up smarthost SMTP Relay

1. Go to Webuzo Admin Panel > Email > Mail Settings.

2. Select the custom code option from the Exim Configuration Manager.

screenshot-192.168.24.128_2005-2024.06.19-19_15_46

3. From the Section Header dropdown, select 'begin authenticators', and from the Rule dropdown, select 'dovecot_login'. Enter the Auth code provided in the SMTP provider's documentation, then click the 'Add Custom Code' button to save.

Auth code

4. Select the 'begin routers' from the Dropdown List, add router code provided in the SMTP provider's documentation and click on the 'Add Custom Code' button to save the code.

routers code

5. Select the 'begin transports' from the Dropdown List, add transport code provided in the SMTP provider's documentation and click on the 'Add Custom Code' button to save the code.

transports code
For SMTP2GO, you can refer to the below configuration

1. Add code in the authenticators section.

smtp2go_login:
  driver = plaintext 
  public_name = LOGIN 
  #specify your smtp2go SMTP username and password below
  hide client_send = : smtp_username : smtp_password

2. Add below code in the routers section.

send_via_smtp2go:
    driver = manualroute
    domains = ! +local_domains
    transport = smtp2go_smtp
    route_list = * mail.smtp2go.com
    host_find_failed = defer
    no_more

3. Add below code in the transport section.

smtp2go_smtp:
    driver = smtp
    port = 25
    hosts = mail.smtp2go.com
    hosts_require_auth = <; $host_address
    message_linelength_limit = 99999999
For MailChannels, you can refer to the below configuration

1. Add code in the authenticators section.

mailchannels_login: 
  driver = plaintext 
  public_name = LOGIN 
  #specify your mailchannels SMTP username and password below
  client_send = : smtp_username : smtp_password

2. Add below code in the routers section.

send_via_mailchannels:
    driver = manualroute
    domains = ! +local_domains
    transport = mailchannels_smtp
    hosts_randomize = true
    route_list = * smtp.mailchannels.net::25 randomize byname
    host_find_failed = defer
    no_more

3. Add below code in the transport section.

mailchannels_smtp:
	driver = smtp
	hosts_require_auth = *
	hosts_require_tls = *
	tls_tempfail_tryclear = true
	headers_add = X-AuthUser: ${if match {$authenticated_id}{.*@.*}\
	{$authenticated_id} {${if match {$authenticated_id}{.+}\
	{$authenticated_id@$primary_hostname}{$authenticated_id}}}}
	dkim_domain = $sender_address_domain
	dkim_selector = default
	dkim_canon = relaxed
	dkim_private_key = /var/webuzo-data/mail/dkim/private/${perl{untaint}{${dkim_domain}}}

You can find your SMTP credentials on the MailChannels Dashboard under Account > SMTP Passwords. Click the eye icon to see your username and password..

mailchannels credientials
For turboSMTP, you can refer to the below configuration

1. Add code in the authenticators section.

turbosmtp_login:
  driver = plaintext
  public_name = LOGIN
  #specify your turbosmtp account username and password below 
  client_send = : smtp_username : smtp_password

2. Add below code in the routers section.

send_via_turbosmtp:
    driver = manualroute
    domains = ! +local_domains
    transport = turbosmtp_smtp
    route_list = "* pro.turbo-smtp.com::587 byname"
    host_find_failed = defer
    no_more

3. Add below code in the transport section.

turbosmtp_smtp:
    driver = smtp
    hosts = pro.turbo-smtp.com
    hosts_require_auth = <; $host_address
    hosts_require_tls = <; $host_address
For SendGrid, you can refer to the below configuration

1. Add code in the authenticators section.

sendgrid_login:
    driver = plaintext
    public_name = LOGIN
    #specify your sendgrid apikey below 
    client_send = : apikey : your_apikey

2. Add below code in the routers section.

send_via_sendgrid:
    driver = manualroute
    domains = ! +local_domains
    transport = sendgrid_smtp
    route_list = "* smtp.sendgrid.net::587 byname"
    host_find_failed = defer
    no_more

3. Add below code in the transport section.

sendgrid_smtp:
  driver = smtp
  hosts = smtp.sendgrid.net
  hosts_require_auth = <; $host_address
  hosts_require_tls = <; $host_address
For mailrelay, you can refer to the below configuration

1. Add code in the authenticators section.

mailrelay_login:
  driver = plaintext
  public_name = LOGIN
  #specify your mailrelay's smtp username and password below 
  client_send = : smtp_username : smtp_password

2. Add below code in the routers section.

send_via_mailrelay:
        driver = manualroute
        domains = ! +local_domains
        transport = mailrelay_smtp
        route_list = * smtp1.s.ipzmarketing.com byname

3. Add below code in the transport section.

mailrelay_smtp:
    driver = smtp
    hosts = smtp1.s.ipzmarketing.com
    hosts_require_auth = <; $host_address
    hosts_require_tls = <; $host_address

You can find your SMTP settings on the under Settings > SMTP settings.

mailrelay smtp settings

Please note that to use Mailrelay's SMTP, you need to configure Mailrelay's provided SPF and DKIM records for all domains. Otherwise, you won't be able to enable the SMTP option.

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