<code class="function">auth_login</code> verifies whether
<em class="replaceable"><code>userid</code></em> exists, and whether it's
<em class="replaceable"><code>password</code></em> is correct.
<em class="parameter"><code>service</code></em> specifies which so-called "service" is
being authenticated; like “<span class="quote">imap</span>” or “<span class="quote">pop3</span>”.
<em class="parameter"><code>service</code></em> may or may not be used by the Courier
<code class="function">auth_login</code> verifies whether
<em class="replaceable"><code>userid</code></em> exists, and whether it's
<em class="replaceable"><code>password</code></em> is correct.
<em class="parameter"><code>service</code></em> specifies which so-called "service" is
being authenticated; like “<span class="quote">imap</span>” or “<span class="quote">pop3</span>”.
<em class="parameter"><code>service</code></em> may or may not be used by the Courier