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Exim 4 Client Authentication on CentOS 6


I want my Exim 4 MTA to use another host as SmartHost.
The remote SmartHost requires authentication, but on port 25.

The procedure is to
  1. Disable direct delivery by looking up MX DNS record (dnslookup section)
  2. Enable SmartHosting (by telling it to use remote_msa transport)
  3. Ajusting remote SMTP settings (remote_msa section)
  4. Setup client authentication

To achieve this, the configuration should be (yes, you comment the whole section):

#dnslookup:
#  driver = dnslookup
#  domains = ! +local_domains
#  transport = remote_smtp
#  ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
#  no_more

Then

smarthost:
  driver = manualroute
  domains = ! +local_domains
  transport = remote_msa
  route_data = the.name.of.remote.smtp
  no_more


Then
remote_msa:
  driver = smtp
  port = 25
  hosts_require_auth = *

Finally

client_auth:
  driver = plaintext
  public_name = LOGIN
  client_send = : test : P@ssw0rd

Note that the default Exim configuration suggests CRAM-MD5 authentication method, but my example gives you how to LOGIN.

I took my inspiration from Exim authentication recipes.



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