y already sent </p>

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<h2 class="memtitle"><span class="permalink"><a href="#af0544df7a935a092d825d8f2380f970f">&#9670;&nbsp;</a></span>callback_arg</h2>

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          <td class="memname">void* smtp_session::callback_arg</td>
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<p>argument for callback function </p>

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