我想用ESMTP协议发送一封电子邮件，并附上一个文件到电子邮件。
发送普通电子邮件时我没有任何错误，只有附件有问题。
这是我用来发送一个普通的电子邮件（和它的作品）：
telnet interia.pl 587 Trying 217.74.65.23... Connected to interia.pl. Escape character is '^]'. 220 ESMTP INTERIA.PL HELO itsme 250 poczta.interia.pl AUTH LOGIN 334 VXNlcm5hbWU6 myusernameinbase64 334 UGFzc3dvcmQ6 mypasswordinbase64 235 2.7.0 Authentication successful MAIL FROM: <[email protected]> 250 2.1.0 Ok RCPT TO: <[email protected]> 250 2.1.5 Ok RCPT TO: <[email protected]> 250 2.1.5 Ok DATA 354 End data with <CR><LF>.<CR><LF> From: [email protected] Subject: msg subject msg body . 250 OK. ID: cbf07b124a2fe43b QUIT 221 2.0.0 Bye Connection closed by foreign host. 然后，我想发送图像作为附件：
telnet interia.pl 587 Trying 217.74.65.23... Connected to interia.pl. Escape character is '^]'. 220 ESMTP INTERIA.PL HELO itsme AUTH LOGIN 334 VXNlcm5hbWU6 myusernameinbase64 334 UGFzc3dvcmQ6 mypasswordinbase64 235 2.7.0 Authentication successful MAIL FROM: <[email protected]> 250 2.1.0 Ok RCPT TO: <[email protected]> 250 2.1.5 Ok RCPT TO: <[email protected]> 250 2.1.5 Ok DATA To: [email protected] From: [email protected] MIME-Version: 1.0 Subject: IMG sending test Content-Type: multipart/mixed; boundary=sep --sep msg body --sep Content--Type: application/octet-stream; name=\"image.png\" Content-Disposition: attachment; filename=\"image.png\" Content-Transfer-Encoding: base64 jEZxHEdKRTIKpRyG4SAIAxXL1UI57xcH3R/F+JMQmxPny2Qs8tuXypnUL8kbFo/3 LAAAAAAAAMA/jBCilNrZ2bmXrY9hYZk83LlUny3LymQy41yLfwJjjDE28+GFQmGO F/P/uOuGxNTxaSa5dUzKivMEQsjy8nKj0djY2CgWi+fn57ce4nDOa2sr8subbviC FDZyYnXVf8xczlzBXI9Rj7keczlzp6fVaJ1orROdxCMlVSijYaf19efpR/r9bbVW 5pxPWdvkUu+0xqkWdB8JAAAAAAAAAFIihMyrDggAAH8PpTSbze7v76+vr5dKpWaz efP/MBzXdSuVimVZR0fvh9/eJUkSah3OenqTFeJ5XqVWqVQqppMmAAAAAAAAAAAA ANwP5tv5vb29Wq22trbWbDallNcNdizL4pxXq9VSqRQEQfr2hdcxgeuml6KFHCIA AAAAAAAAAACA+4VSalnW4eFhq9Wq1+vD4XDc8nHCL6MJuimJikbWAAAAAElFTkSu QmCC ... --sep-- . QUIT
图像由SMTP服务器接收，但无法打开。
我究竟做错了什么？
您错过了标题和邮件正文之间的最小空白行。
还有分隔消息部分所需的空白行。 从RFC
From: Nathaniel Borenstein <[email protected]> To: Ned Freed <[email protected]> Subject: Sample message MIME-Version: 1.0 Content-type: multipart/mixed; boundary="simple boundary" This is the preamble. It is to be ignored, though it is a handy place for mail composers to include an explanatory note to non-MIME compliant readers. --simple boundary This is implicitly typed plain ASCII text. It does NOT end with a linebreak. --simple boundary Content-type: text/plain; charset=us-ascii This is explicitly typed plain ASCII text. It DOES end with a linebreak. --simple boundary-- This is the epilogue. It is also to be ignored.