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本文介紹了Java郵件無法使用TLS或SSL連接到SMTP的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

0

我正在嘗試從Java連接到郵件服務器。我已經能夠使用相同的代碼成功地從Java連接到許多郵件服務器，包括Gmail、Rackspace、GoPardy和其他，但無論我嘗試什么設置，這個都不起作用。

    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.starttls.enable", "true");
    props.put("mail.smtp.host", this.outgoingHost);
    props.put("mail.smtp.port", 587);
    props.put("mail.smtp.ssl.trust", this.outgoingHost);
    session = Session.getInstance(props, new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(username, password);
        }
    });

出現以下錯誤：javax.mail.MessagingException：無法將套接字轉換為TLS；嵌套異常為：javax.net.ssl.SSLException：無法識別的SSL消息，是否為明文連接？

我也試過了

    props.put("mail.smtp.host", this.outgoingHost);
    props.put("mail.smtp.port", 587);
    props.put("mail.smtp.socketFactory.port", 587);
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
    props.put("mail.smtp.auth", "true");
    props.put("mail.smtp.ssl.trust", this.outgoingHost);
    session = Session.getInstance(props, new javax.mail.Authenticator() {
        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(username, password);
        }
    });

失敗，錯誤為：javax.mail.SendFailedException：地址無效；嵌套異常為：com.sun.mail.smtp.SMTPAddressFailedException：端口587上的郵件提交需要550 SMTP身份驗證

我也嘗試了端口465，但超時。

我能夠使用相同的SMTP設置從雷鳥電子郵件客戶端(相同的主機/端口/用戶/PW，但它必須執行其他操作)發送郵件。

使用Java Mail 1.51

有什么想法嗎？

推薦答案

當您使用SSL時(smtps)，您不使用STARTTLS(msa)，反之亦然。SSL默認為端口465，TLS默認為端口587。您可能還必須使用mail.smtp.ssl.protocols或mail.smtps.ssl.protocols設置SSL協議，以指定將為SSL/TLS連接啟用的SSL協議。最好避免覆蓋PasswordAuthentication發送憑據，使用SMTPTransportconnect方法。同樣重要的是，對于SSL，您必須使用smtpsformail.transport.protocol，并使用mail.smtps道具而不是mail.smtp。我將提供關于SSL和TLS的示例。

您可以使用session.setDebug(true)或props.put("mail.debug", "true")在控制臺中調試并查看整個通信；這將非常有幫助，因為您將看到與服務器的整個telnet通信。

使用TLS(STARTTLS)587：

// Set debug so we see the whole communication with the server
props.put("mail.debug", "true");

props.put("mail.transport.protocol", "smtp");
props.put("mail.host", outgoingHost);
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "587");

// Enable STARTTLS
props.put("mail.smtp.starttls.enable", "true");

// Accept only TLS 1.1 and 1.2
props.setProperty("mail.smtp.ssl.protocols", "TLSv1.1 TLSv1.2");

Session session = Session.getInstance(props, null);
session.setDebug(true);

// Create an SMTP transport from the session
SMTPTransport t = (SMTPTransport)session.getTransport("smtp");

// Connect to the server using credentials
t.connect(outgoingHost, username, password);

// Send the message
t.sendMessage(msg, msg.getAllRecipients());

使用STARTTLS：

的調試輸出示例

^{注意傳輸協議是smtp}

DEBUG: JavaMail version 1.5.1
...
DEBUG: setDebug: JavaMail version 1.5.1
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "mail.example.com", port 587, isSSL false
220-srv.example.com ESMTP Exim 4.92 #2 Wed, 18 Mar 2020 15:55:56 +0200 
220-We do not authorize the use of this system to transport unsolicited, 
220 and/or bulk e-mail.
DEBUG SMTP: connected to host "mail.example.com", port: 587

EHLO host.docker.internal
250-srv.example.com Hello ppp.home.provider.com [x.x.x.x]
250-8BITMIME
250-PIPELINING
250-AUTH PLAIN LOGIN
250-STARTTLS
250 HELP
DEBUG SMTP: Found extension "SIZE", arg "52428800"
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "AUTH", arg "PLAIN LOGIN"
DEBUG SMTP: Found extension "STARTTLS", arg ""
DEBUG SMTP: Found extension "HELP", arg ""
STARTTLS
220 TLS go ahead
EHLO host.docker.internal
250-srv.example.com Hello ppp.home.provider.com [x.x.x.x]
250-SIZE 52428800
250-8BITMIME
250-PIPELINING
250-AUTH PLAIN LOGIN
250 HELP
DEBUG SMTP: Found extension "SIZE", arg "52428800"
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "AUTH", arg "PLAIN LOGIN"
DEBUG SMTP: Found extension "HELP", arg ""
DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM 
DEBUG SMTP: AUTH LOGIN command trace suppressed
DEBUG SMTP: AUTH LOGIN succeeded
DEBUG SMTP: use8bit false
MAIL FROM:<[email protected]>
250 OK
RCPT TO:<[email protected]>
250 Accepted
DEBUG SMTP: Verified Addresses
DEBUG SMTP:   [email protected]
DATA
354 Enter message, ending with "." on a line by itself
Date: Wed, 18 Mar 2020 15:55:57 +0200 (EET)
From: [email protected]
To: [email protected]
Message-ID: <[email protected]>
Subject: Test from JAVA!
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: smtpsend

Message from the JAVA app STARTTLS!
.
250 OK id=1jEZAt-009Y7x-5Z
Response: 250 OK id=1jEZAt-009Y7x-5Z

QUIT
221 srv.example.com closing connection

使用SSL465：

// Set debug so we see the whole communication with the server
props.put("mail.debug", "true");

// All mail props for protocol will be mail.smtps

// We set smtps transport protocol for SSL
props.put("mail.transport.protocol", "smtps");
props.put("mail.host", outgoingHost);
props.put("mail.smtps.auth", "true");
props.put("mail.smtps.port", "465");
props.put("mail.smtps.ssl.trust", outgoingHost);
props.put("mail.smtps.ssl.enable", "true");

// Accept only TLS 1.1 and 1.2
props.setProperty("mail.smtps.ssl.protocols", "TLSv1.1 TLSv1.2");

Session session = Session.getInstance(props, null);
session.setDebug(true);

// Create an SMTP transport from the session
SMTPTransport t = (SMTPTransport)session.getTransport("smtps");

// Connect to the server using credentials
t.connect(outgoingHost, username, password);

// Send the message
t.sendMessage(msg, msg.getAllRecipients());

使用SSL的調試輸出示例：

^{請注意，傳輸協議是smtps}

DEBUG: JavaMail version 1.5.1
...
DEBUG: setDebug: JavaMail version 1.5.1
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "mail.example.com", port 465, isSSL true
220-srv.example.com ESMTP Exim 4.92 #2 Wed, 18 Mar 2020 16:09:51 +0200 
220-We do not authorize the use of this system to transport unsolicited, 
220 and/or bulk e-mail.
DEBUG SMTP: connected to host "mail.example.com", port: 465

EHLO host.docker.internal
250-srv.example.com Hello ppp.home.provider.com [x.x.x.x]
250-SIZE 52428800
250-8BITMIME
250-PIPELINING
250-AUTH PLAIN LOGIN
250 HELP
DEBUG SMTP: Found extension "SIZE", arg "52428800"
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "AUTH", arg "PLAIN LOGIN"
DEBUG SMTP: Found extension "HELP", arg ""
DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM 
DEBUG SMTP: AUTH LOGIN command trace suppressed
DEBUG SMTP: AUTH LOGIN succeeded
DEBUG SMTP: use8bit false
MAIL FROM:<[email protected]>
250 OK
RCPT TO:<[email protected]>
250 Accepted
DEBUG SMTP: Verified Addresses
DEBUG SMTP:   [email protected]
DATA
354 Enter message, ending with "." on a line by itself
Date: Wed, 18 Mar 2020 16:09:50 +0200 (EET)
From: [email protected]
To: [email protected]
Message-ID: <[email protected]>
Subject: Test from JAVA!
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: smtpsend

Message from the JAVA app SSL!
.
250 OK id=1jEZOK-009bbA-5C
Response: 250 OK id=1jEZOK-009bbA-5C

QUIT
221 srv.example.com closing connection

這篇關于Java郵件無法使用TLS或SSL連接到SMTP的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，