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On the Admin page, under Settings->Writing:

Post via e-mailTo post to WordPress by e-mail you must set up a secret e-mail
account with POP3 access. Any mail received at this address will be
posted, so it’s a good idea to keep this address very secret. Here are
three random strings you could use:  …..

I created a pop3 mail address including a simple name and a random string, then added whitelist protection to only allow e-mail from certain addresses, in addition to Spam Assassin protection.

I went back to the Post via e-mail section in WordPress and added my mail server information.

This is the first post using this method.