📅 最后修改于: 2020-11-06 06:33:46 🧑 作者: Mango
IMAP是一种电子邮件检索协议，它不下载电子邮件。它只是读取并显示它们。这在低带宽条件下非常有用。 Python的客户端库imaplib用于通过imap协议访问电子邮件。
IMAP代表Internet邮件访问协议。它是在1986年首次提出的。
关键点：
IMAP允许客户端程序在服务器上处理电子邮件，而无需在本地计算机上下载它们。
该电子邮件由远程服务器保留和维护。
它使我们能够执行任何操作，例如下载，删除邮件而不阅读邮件。它使我们能够创建，操作和删除称为邮箱的远程消息文件夹。
IMAP使用户可以搜索电子邮件。
它允许并发访问多个邮件服务器上的多个邮箱。
下表描述了一些IMAP命令：
| S.N. | Command Description |
|---|---|
| 1 | IMAP_LOGIN This command opens the connection. |
| 2 | CAPABILITY This command requests for listing the capabilities that the server supports. |
| 3 | NOOP This command is used as a periodic poll for new messages or message status updates during a period of inactivity. |
| 4 | SELECT This command helps to select a mailbox to access the messages. |
| 5 | EXAMINE It is same as SELECT command except no change to the mailbox is permitted. |
| 6 | CREATE It is used to create mailbox with a specified name. |
| 7 | DELETE It is used to permanently delete a mailbox with a given name. |
| 8 | RENAME It is used to change the name of a mailbox. |
| 9 | LOGOUT This command informs the server that client is done with the session. The server must send BYE untagged response before the OK response and then close the network connection. |
在下面的示例中，我们使用用户凭据登录到Gmail服务器。然后，我们选择在收件箱中显示消息。使用for循环逐个显示获取的消息，最后关闭连接。
import imaplib
import pprint
imap_host = 'imap.gmail.com'
imap_user = 'username@gmail.com'
imap_pass = 'password'
# connect to host using SSL
imap = imaplib.IMAP4_SSL(imap_host)
## login to server
imap.login(imap_user, imap_pass)
imap.select('Inbox')
tmp, data = imap.search(None, 'ALL')
for num in data[0].split():
tmp, data = imap.fetch(num, '(RFC822)')
print('Message: {0}\n'.format(num))
pprint.pprint(data[0][1])
break
imap.close()
根据邮箱配置，显示邮件。