If you know your users are well-behaved and always send mail
through your servers, you don't need to do anything. (Law
firms with their voluminous disclaimers should already be in
this category. So should ISPs that provide SMTP AUTH.)
Otherwise, you should set up SMTP
AUTH access for your users. Many ISPs already support this;
yours may be one of them.
If you're a user, make sure that when you send mail it
goes through your ISP's mail servers. You may need to
enable Authenticated SMTP if you regularly connect to the
Internet from outside your ISP's network.
We have prepared separate instructions for websites that generate email
and for outsourced email service
providers who send mail on contract.
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