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Carl Hörberg
Asked: 2009-07-16 23:08:33 +0800 CST

Fastest way to allow sendmail relay through smarthost?

  • 772

I only want sendmail to relay through my ISP's smtp server, nothing else. How do i set it up?

linux smtp sendmail smarthost

4 Answers

  1. Best Answer

    You have specified answer in the question itself. You can do that using 

    define(`SMART_HOST', `smtp.your.provider')dnl

    Are you facing any problem using this. After editing /etc/mail/sendmail.mc you should go to directory /etc/mail. Type make and then restart sendmail service for changes to take effect. Then send a test mail and see message headers (Received:) to see if configuration worked.

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  2. If you aren't doing anything more fancy with the cumbersome beast that is Sendmail then you could consider using SSMTP instead.

    It's a relay-only MTA which is lightweight and couldn't be simpler to configure.

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  3. Do yourself a huge favour and replace sendmail with either a modern mta like postfix or something more lightweight like ssmtp. I'm amzed that sendmail is still used voluntarily

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  4. Nullmailer, IMHO, is even easier to configure. Here is a quick howto:

    apt-get install -y nullmailer

    Edit this file: 

    nano /etc/mailname
    • Enter your domain name, like mydomain.com
    • Save

    Edit another file: 

    nano /etc/nullmailer/remotes
    • Enter your smtp server data: [mysmtpserver.com] smtp --auth-login --user=[username] --pass=[password]
    • Save

    Source

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