# Learn how BooleanSMTP works

> Three short, interactive lessons — how a WordPress email travels, which mailer to pick, and why a sent test sometimes never arrives.

These lessons explain what happens behind the settings screens. Each one takes a few minutes, has an interactive diagram
you can step through at your own pace, and ends with two or three questions. Your progress is kept in this browser only.

<LearnPath
	steps={[
		{
			id: 'how-sending-works',
			title: 'The journey of an email',
			href: '/learn/how-sending-works/',
			description: 'Follow one message from wp_mail() to the inbox — and see what happens when the provider is down.',
		},
		{
			id: 'choose-a-mailer',
			title: 'Which mailer should I use?',
			href: '/learn/choose-a-mailer/',
			description: 'Answer four questions and see the providers that fit your site, with the reasons.',
		},
		{
			id: 'nothing-arrived',
			title: '"The test said sent, but nothing arrived"',
			href: '/learn/nothing-arrived/',
			description: 'Walk the checks support would ask you for, one question at a time.',
		},
	]}
/>