"The IMAP server has unexpectedly disconnected" 关于邮件套件获取消息的方法

Question

我想使用 mailkit 接收电子邮件，但在 selectedFolder.GetMessage 方法上收到此错误："IMAP 服务器意外断开连接"。

此问题仅适用于 2 或 3 条消息，而不是全部。

这是邮件套件日志

Connected to imap://*****:143/?starttls=when-available
S: * OK IMAP4rev1 SmarterMail
C: B00000000 CAPABILITY
S: * CAPABILITY IMAP4rev1 AUTH=CRAM-MD5 UIDPLUS QUOTA XLIST CHILDREN
S: B00000000 OK CAPABILITY completed
C: B00000001 AUTHENTICATE CRAM-MD5
S: + PDE4MDMxODE3NDkuNjMhdGEuY29tPg==
C: bW9zbGVtaUBwaWRtY28uaXIgZjUwZxYjhlNDQ=
S: B00000001 OK CRAM authentication successful
C: B00000002 CAPABILITY
S: * CAPABILITY IMAP4rev1 AUTH=CRAM-MD5 UIDPLUS QUOTA XLIST CHILDREN
S: B00000002 OK CAPABILITY completed
C: B00000003 LIST "" ""
S: * LIST (Noselect) "/" ""
S: B00000003 OK LIST completed
C: B00000004 LIST "" "INBOX"
S: * LIST (HasNoChildren) "/" "Inbox"
S: B00000004 OK LIST completed
C: B00000005 XLIST "" "*"
S: * XLIST (HasNoChildren Trash) "/" "Deleted Items"
S: * XLIST (HasNoChildren) "/" "ESET Antispam"
S: * XLIST (HasNoChildren Inbox) "/" "Inbox"
S: * XLIST (HasNoChildren) "/" "Infected Items"
S: * XLIST (HasNoChildren Spam) "/" "Junk E-Mail"
S: * XLIST (HasNoChildren Sent) "/" "Sent Items"
S: * XLIST (HasNoChildren) "/" "Drafts"
S: B00000005 OK XLIST completed
C: B00000006 EXAMINE Inbox
S: * 44 EXISTS
S: * 0 RECENT
S: * OK [UNSEEN 24] Message 24 is first unseen
S: * OK [UIDVALIDITY 0] UIDs valid
S: * OK [UIDNEXT 1869] Predicted next UID
S: * FLAGS (Answered Flagged Deleted Seen Draft)
S: * OK [PERMANENTFLAGS ()]
S: B00000006 OK [READ-ONLY] EXAMINE completed
C: B00000007 UID FETCH 1826 (BODY.PEEK[])
S: * 4 FETCH (BODY[] 

Answer 1

问题是您与服务器的 TCP/IP 连接被切断了。

发生这种情况的原因有很多，包括：

1. 服务器崩溃
2. 服务器已重新启动
3. 服务器失去网络连接
4. 客户端丢失了网络连接

您只需通过尝试重新连接并重新发出命令来处理这些意外断开连接。