我们的邮件附件有问题。目前我正在为带有附件的 Outlook 日历活动工作。一切都很好，我收到了带有附件的邮件，但只有当附件小于 10Kb 时我才会收到电子邮件。否则我没有收到任何邮件。如果我使用
chunk_split()
功能而不是收到带有超过 10Kb 文件附件的电子邮件，但只收到文件的一部分（我用文本文件测试，我只收到前几行）。
我检查了服务器，它有能力发送大文件。
这是我的代码。请帮帮我。。
if($filename_path ==''){
$filename_path = './Upload/Cal_temp/'.$filename2;
$filename_pathnew = base_url().'Upload/Cal_temp/'.$filename2;
}
$calendid = $this->input->post('calendar_id');
$handle = fopen($filename_path, "r");
$contents = fread($handle, filesize($filename_path));
fclose($handle);
$finaldata = base64_encode($contents);
$finaldata = chunk_split($finaldata);
$dataone = filesize($filename_path);
$datatwo = strlen($contents);
define('DATE_ICAL', 'Ymd\THis');
$fromname = 'example';
$vcal = "BEGIN:VCALENDAR\n";
$vcal .= "VERSION:2.0\n";
$vcal .= "METHOD:PUBLISH\n"; //requied by Outlook
$vcal .= "X-MS-OLK-FORCEINSPECTOROPEN:TRUE\n";
$vcal .= "BEGIN:VEVENT\n";
/* $vcal .= "STATUS:".$this->input->post('status')."\n"; */
$vcal .= "DTSTART:".date(DATE_ICAL, strtotime($s_date.' '.$s_time))."\n";
$vcal .= "DTEND:".date(DATE_ICAL, strtotime($e_date.' '.$e_time))."\n";
$vcal .= "SUMMARY: ".$desc_txt." ".$empname['firstname'].' '.$empname['lastname']."-".$clientname['firstname'].' '.$clientname['lastname']."\n";
$vcal .= "DESCRIPTION: Your appointment has been updated for ".$empname['firstname'].' '.$empname['lastname']." with ".$clientname['firstname'].' '.$clientname['lastname']." with regard to ".$jobnumber." and ".$taskcode." between ".$s_date.' '.$s_time." and ".$e_date.' '.$e_time."\r\n\r\n";
$vcal .= "ATTACH;ENCODING=BASE64;VALUE=BINARY;X-FILENAME=".$filename2.":".$finaldata."=\n";
$vcal .= "CLASS:PUBLIC\n";
$vcal .= "TRANSP:OPAQUE\n";
$vcal .= "UID:". $calendid ."\n";
$vcal .= "SEQUENCE:0\n";
$vcal .= "SUMMARY;LANGUAGE=en-us:excel\n";
$vcal .= "X-MICROSOFT-CDO-BUSYSTATUS:BUSY
X-MICROSOFT-CDO-IMPORTANCE:1
X-MICROSOFT-DISALLOW-COUNTER:FALSE
X-MS-OLK-ALLOWEXTERNCHECK:TRUE
X-MS-OLK-AUTOFILLLOCATION:FALSE
X-MS-OLK-CONFTYPE:0
BEGIN:VALARM
TRIGGER:-PT15M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
END:VCALENDAR";
$headers = "From: ".$fromemail."\r\nReply-To: ";
$headers .= "\r\nMIME-version: 1.0\r\nContent-Type: text/calendar; method=REQUEST; charset=\"utf-8\"";
$headers .= "\r\n Content-Transfer-Encoding: base64\r\nX-Mailer: Microsoft Office Outlook 12.0";
//$headers .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n\r\n";
$subject = 'Your appointment has been updated';
mail($email, $subject, $vcal, $headers);
我尝试了几乎所有类型的标题，但没有运气。