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All of my email clients (Outlook, Thunderbird, etc) are currently using my sendmail server to send email.  The server does not require authentication for SMTP.

If I set my sendmail server to require SMTP authentication, that means that all of my email clients will need an account on my server, correct?

As it turns out they already do because their mailboxes are on that server; they use POP to retrieve mail from there.

But if I set the server to require SMTP authentication, does that mean that other people can no longer send email to my users?

For example, joe@yahoo.com sends an email to one of my users...it would be denied because he can't authenticate with my server?


RE: authentication

They would still be able to send email to your users, the authentication part comes into play when they want to use your server to send mail which you don't want to allow (sendmail doesn't allow relaying by default)


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