reference/mail/setup.xml
ba08db8805ddb14cbab613c893dd47eacbda22f2
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If you use another mail program, such as <productname>qmail</productname>
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or <productname>postfix</productname>, be sure to
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use the appropriate sendmail wrappers that come with them. PHP will
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first look for sendmail in your <literal>PATH</literal>, and then in
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first look for sendmail in your <envar>PATH</envar>, and then in
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the following:
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<literal>/usr/bin:/usr/sbin:/usr/etc:/etc:/usr/ucblib:/usr/lib</literal>.
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It's highly recommended to have sendmail available from your
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<literal>PATH</literal>. Also, the user that compiled PHP must have
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<envar>PATH</envar>. Also, the user that compiled PHP must have
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permission to access the sendmail binary.
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</para>
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</section>
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