IMAPMessage.getRecipients() 和 IMAPMessage.getAllRecipients() 返回 null

Question

我正在编写一个 IMAP 消息轮询器（在业务应用程序中使用）。我能够连接、迭代收件箱中的消息、读取其标题和内容，但调用 getAllRecipients() 和 getRecipients(Message.RecipientType.TO) 始终返回 null。

Message messages[] = inbox.getMessages();
  for (Message message : messages) {
    IMAPMessage imapMessage = (IMAPMessage) message;
      Address[] toRecipients = imapMessage.getRecipients(Message.RecipientType.TO);
      Address[] allRecipients = imapMessage.getAllRecipients();

这令人费解。收件箱中的邮件是通过常规邮件客户端发送的，因此没有任何异常。

IMAP 服务器正在运行 Dovecot。

* OK Dovecot ready.
A0 CAPABILITY
* CAPABILITY IMAP4rev1 SASL-IR SORT THREAD=REFERENCES MULTIAPPEND UNSELECT LITERAL+ IDLE CHILDREN NAMESPACE LOGIN-REFERRALS STARTTLS AUTH=PLAIN
A0 OK Capability completed.

这是在执行上述操作（并且还调用 imapMessage.getContent()）时使用 Wireshark 捕获的相关流量转储。

A3 SELECT Inbox
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags permitted.
* 2 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1277135188] UIDs valid
* OK [UIDNEXT 3] Predicted next UID
A3 OK [READ-WRITE] Select completed.

A4 FETCH 1 (BODYSTRUCTURE)
* 1 FETCH (BODYSTRUCTURE ("text" "plain" ("charset" "us-ascii") NIL NIL "7bit" 12 1 NIL NIL NIL))
A4 OK Fetch completed.

A5 FETCH 1 (BODY[TEXT]<0.12>)
* 1 FETCH (BODY[TEXT]<0> {12}
here it is
)
A5 OK Fetch completed.

A6 FETCH 1 (FLAGS)
* 1 FETCH (FLAGS (\Seen))
A6 OK Fetch completed.

A7 FETCH 1 (BODY.PEEK[HEADER])
* 1 FETCH (BODY[HEADER] {399}
Return-Path: <EDITED>
Received: from EDITED; Sat, 5 Jun 2010 15:33:13 -0400
Date: Sat, 5 Jun 2010 15:32:40 -0400
From: EDITED
Message-Id: <EDITED>
Subject: Test Message
Lines: 1
)
A7 OK Fetch completed.

A8 FETCH 1 (ENVELOPE INTERNALDATE RFC822.SIZE)
* 1 FETCH (INTERNALDATE "05-Jun-2010 15:33:32 -0400" RFC822.SIZE 411 ENVELOPE ("Sat, 5 Jun 2010 15:32:40 -0400" "Test Message" ((NIL NIL "myediteduser" "myediteddomain")) ((NIL NIL "myediteduser" "myediteddomain")) ((NIL NIL "myediteduser" "myediteddomain")) NIL NIL NIL NIL "<EDITED>"))
A8 OK Fetch completed.

A9 FETCH 2 (BODYSTRUCTURE)
* 2 FETCH (BODYSTRUCTURE (("text" "plain" ("charset" "iso-8859-1") NIL NIL "quoted-printable" 8 0 NIL NIL NIL)("text" "html" ("charset" "iso-8859-1") NIL NIL "quoted-printable" 341 9 NIL NIL NIL) "alternative" ("boundary" "----=_NextPart_000_0003_01CB1137.CCF78C80") NIL NIL))
A9 OK Fetch completed.

任何提示表示赞赏。我不知道是否还应该拨打其他电话，或者 IMAP 服务器中是否有设置。我查看了 IMAPMessage 的所有方法，以防在调用 getRecipients() 和 getAllRecipients() 之前运行某些内容，但什么也没有。还用谷歌搜索了一段时间，发现没有其他我应该打电话的东西。

Answer 1

只是关闭它：这是邮件服务器设置的问题，现已修复。