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<p>length of the subject string </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a5884425cb5ce964d8383b29cc20208d7">&#9670;&nbsp;</a></span>timer</h2>

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          <td class="memname">u16_t smtp_session::timer</td>
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<p>timeout handling, if this reaches 0, the connection is closed </p>

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