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I need to relay email in sendmail as follows

  • Host example.mail.protection.outlook.com
  • Port 2525
  • No authentication
  • No SSL

I know I need to set the following in the sendmail.mc file: define(`SMART_HOST', `example.mail.protection.outlook.com')dnl

If I needed to change ports, do I just do the following: define(`SMART_HOST', `example.mail.protection.outlook.com:2525')dnl

I assume if I don't specify a username/password then there is no authentication.

How do I ensure that TLS is disabled?

AnFi
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1 Answers1

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You may make relay mailer connect to port other than default 25.
Sendmail by default uses relay mailer unless another mailer is explicitely specified (mailer:host.domain).

# sendmail.mc
define(`SMART_HOST',`relay.example.com`)dnl
define(`RELAY_MAILER_ARGS', `TCP $h 2525')dnl

See https://unix.stackexchange.com/questions/132711/using-port-587-with-sendmail

AnFi
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