nixos/piwik: Remove part about mail problems Sending mail works out of the box as of resolution of #26611.

Changed files
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nixos
modules
services
web-apps
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nixos/modules/services/web-apps/piwik-doc.xml
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</para>
</listitem>
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<listitem>
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<para>
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Sending mail from piwik, e.g. for the password reset function, might not work out of the box:
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There's a problem with using <command>sendmail</command> from <literal>php-fpm</literal> that is
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being investigated at <link xlink:href="https://github.com/NixOS/nixpkgs/issues/26611" />.
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If you have (or don't have) this problem as well, please report it. You can enable SMTP as method
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to send mail in piwik's <quote>General Settings</quote> > <quote>Mail Server Settings</quote> instead.
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</para>
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</listitem>
</itemizedlist>
</section>