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5月邮件正常工作，但发送邮件后gmail上显示未知发件人错误。我的PHP代码如下通过php发送电子邮件
$sendto="[email protected]";
$subject = "Payment details of ".$dmail['name'];
$message = "<br><br>";
$message .= '<table border="0" cellspacing="5" cellpadding="4" width="600"style="border-collapse:collapse; font-family:Lucida Sans; border-color:#CCCCCC">
<tr style="background-color:#023564; color:#FFF;">
<td colspan="2"><h3 align="center">Registration Information From Midterm Delhi CSI 2017</h3></td>
</tr>
<tr>
<td width="54%"><p>Name</p></td>
<td width="46%"><p>'.$dmail['name'].'</p></td>
</tr>
<tr>
<td width="54%"><p>Age</p></td>
<td width="46%"><p>'.$dmail['age'].'</p></td>
</tr>
<tr>
<td width="54%"><p>Institution</p></td>
<td width="46%"><p>'.$ucomp.'</p></td>
</tr>
<tr>
<td width="54%"><p>Designation</p></td>
<td width="46%"><p>'.$dmail['designation'].'</p></td>
</tr>
<tr>
<td width="54%"><p>Postal Address</p></td>
<td width="46%"><p>'.$dmail['address'].'</p></td>
</tr>
<tr>
<td width="54%"><p>City</p></td>
<td width="46%"><p>'.$dmail['city'].'</p></td>
</tr>
<tr>
<td width="54%"><p>State</p></td>
<td width="46%"><p>'.$dmail['state'].'</p></td>
</tr>
<tr>
<td width="54%"><p>Pin</p></td>
<td width="46%"><p>'.$dmail['pin'].'</p></td>
</tr>
<tr>
<td width="54%"><p>Country</p></td>
<td width="46%"><p>'.$dmail['country'].'</p></td>
</tr>
<tr>
<td width="54%"><p>Phone (Off).</p></td>
<td width="46%"><p>'.$dmail['phone_off'].'</p></td>
</tr>
<tr>
<td width="54%"><p>Phone (Res).</p></td>
<td width="46%"><p>'.$dmail['phone_res'].'</p></td>
</tr>
<tr>
<td width="54%"><p>Mobile No</p></td>
<td width="46%"><p>'.$dmail['phone'].'</p></td>
</tr>
<tr>
<td width="54%"><p>E-mail</p></td>
<td width="46%"><p>'.$email.'</p></td>
</tr>
<tr>
<td width="54%"><p>Gender</p></td>
<td width="46%"><p>'.$dmail['gender'].'</p></td>
</tr>
<tr>
<td width="54%"><p>Food Preference</p></td>
<td width="46%"><p>'.$dmail['dite'].'</p></td>
</tr>
<tr>
<td width="54%"><p>CSI Number</p></td>
<td width="46%"><p>'.$dmail['ioa_membership_no'].'</p></td>
</tr>
<tr>
<td width="54%"><p>MCI Number</p></td>
<td width="46%"><p>'.$csi.'</p></td>
</tr>
</table>';
$username=$dmail['name'];
$header = "MIME-Version: 1.0\r\n";
$header .= "Content-type: text/html\r\n";
$header .= "From: ".$username."\r\n";
$header .="\r\n";
$retval = mail ($sendto,$subject,$message,$header);
return $retval;
电子邮件的发送者是谁发来的消息被发送到消息，而不是地址... – arkascha
什么是'$ username'的一个我想这不是一个电子邮件地址 – RiggsFolly
不要给作为$用户名。只要给[email protected] –