分享程序员开发的那些事...
更新时间：2023-02-25 11:02:50
我清理了多部分边界说明符并得到了这个，它适用于我的服务器(我在这里省略了 SMTP 命令):
I cleaned up the multipart boundary specifiers and got this, which works for me on my server (I've left off the SMTP commands here):
From: "Edited Out" <editedout@yahoo.com>
To: "Edited Out" <editedout@yahoo.com>
Subject: Testing 4
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="boundary-type-1234567892-alt"
--boundary-type-1234567892-alt
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Testing the text to see if it works!
--boundary-type-1234567892-alt
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<html>Does this actually work?</html>
--boundary-type-1234567892-alt
Content-Transfer-Encoding: base64
Content-Type: text/plain;name="Here2.txt"
Content-Disposition: attachment;filename="Here2.txt"
KiAxMyBGRVRDSCAoQk9EWVtURVhUXSB7NjU5fQ0KLS1fZjZiM2I1ZWUtMjA3YS00ZDdiLTg0NTgtNDY5YmVlNDkxOGRhXw0 KQ29udGVudC1UeXBlOiB0ZXh0L3BsYWluOyBjaGFyc2V0PSJpc28tODg1OS0xIg0KQ29udGVudC1UcmFuc2Zlci1FbmNvZG luZzogcXVvdGVkLXByaW50YWJsZQ0KDQoNCkp1c3Qgc2VlaW5nIHdoYXQgdGhpcyBhY3R1
YWxseSBjb250YWlucyEgCQkgCSAgIAkJICA9DQoNCi0tX2Y2YjNiNWVlLTIwN2EtNGQ3Yi04NDU4LTQ2OWJlZTQ5MThkYV8 NCkNvbnRlbnQtVHlwZTogdGV4dC9odG1sOyBjaGFyc2V0PSJpc28tODg1OS0xIg0KQ29udGVudC1UcmFuc2Zlci1FbmNvZG luZzogcXVvdGVkLXByaW50YWJsZQ0KDQo8aHRtbD4NCjxoZWFkPg0KPHN0eWxlPjwhLS0N
Ci5obW1lc3NhZ2UgUA0Kew0KbWFyZ2luOjBweD0zQg0KcGFkZGluZzowcHgNCn0NCmJvZHkuaG1tZXNzYWdlDQp7DQpmb25 0LXNpemU6IDEwcHQ9M0INCmZvbnQtZmFtaWx5OlRhaG9tYQ0KfQ0KLS0+PC9zdHlsZT48L2hlYWQ+DQo8Ym9keSBjbGFzcz 0zRCdobW1lc3NhZ2UnPjxkaXYgZGlyPTNEJ2x0cic+DQpKdXN0IHNlZWluZyB3aGF0IHRo
aXMgYWN0dWFsbHkgY29udGFpbnMhIAkJIAkgICAJCSAgPC9kaXY+PC9ib2R5Pg0KPC9odG1sPj0NCg0KLS1fZjZiM2I1ZWU tMjA3YS00ZDdiLTg0NTgtNDY5YmVlNDkxOGRhXy0tDQopDQpmbHlubmNvbXB1dGVyIE9LIEZFVENIIGNvbXBsZXRlZA
--boundary-type-1234567890-alt--
多部分电子邮件中的边界说明符是不太可能出现在电子邮件正文/附件中的任意文本.当它在前面显示两个破折号时，表示新部分的开头(包括第一部分.当它在开头和结尾显示两个破折号时，表示邮件的结尾.
The boundary specifier in a multipart email is any arbitrary text that's not likely to appear in the email body/attachments. When it shows up with two dashes in front, that specifies the beginning of new part (including the very first part. When it shows up with two dashes at the beginning and end, that specifies the end of the mail.
您的原始邮件在邮件中间有这个结束边界"标记(就在 <html>这真的有效吗?</html>)，并且有两个不同的边界标记(--boundary-type-1234567890 和 --boundary-type-1234567892-alt).这就解释了为什么附件被遗漏了.
Your original mail had this "end boundary" marker in the middle of the mail (right after <html>Does this actually work?</html>), and had two different boundary markers (--boundary-type-1234567890 and --boundary-type-1234567892-alt). That explains why the attachment was left off.