Spring mvc SMTP连接在354之后被拒绝，仅来自与SMTP后缀部署在同一计算机上的web服务器

我有个奇怪的问题。我的SMTP服务器部署在linux主机（postfix/dovecot）上。我有一个基于SpringMVC+Tomcat的web应用程序。如果我从本地macbook连接到Lunix服务器（Centos）上的SMTP服务器，则消息可以正常发送。然而，当我在Linux系统上的Tomcat7上部署web应用程序（使用可信的CA证书SSL）时，它在从服务器接收354后给了我一个连接拒绝异常。我还为smtp生成了开放ssl证书，并将其添加到jdk/jre/lib/security/cacert中的可信证书中。我在macbook和linux服务器上都尝试过smtp和smtps。在dev上，这两种方法都有效。在linux（prod）上，两者都失败。请注意，在dev和prod中，它都能够进行身份验证和登录。只有在收到SMTP的“354 End data with.”响应后，开发人员和产品人员的行为才会有所不同

从my spring appServerContext.xml：

            <property name="host" value="${linux.host}" />
            <property name="port" value="${linux_ssl.port}" />
            <property name="username" value="${username}" />
            <property name="password" value="${password}" />
            <property name="protocol" value="smtps" />

    <property name="javaMailProperties">
        <props>
            <prop key="mail.smtps.auth">true</prop>
            <prop key="mail.smtps.connectiontimeout">5000</prop>
            <prop key="mail.smtps.sendpartial">true</prop>
            <prop key="mail.smtps.userset">true</prop>
            <prop key="mail.mime.charset">UTF-8</prop>
            <prop key="mail.smtps.isSecure">true</prop>
            <prop key="mail.smtps.requiresAuthentication">true</prop>
            <prop key="mail.smtps.port">465</prop>
            <prop key="mail.smtps.socketFactory.class">javax.net.ssl.SSLSocketFactory</prop>
            <prop key="mail.smtps.socketFactory.fallback">true</prop>
            <prop key="mail.smtps.starttls.enable">true</prop>
            <prop key="mail.debug">true</prop>
            <!-- <prop key="mail.smtps.ssl.checkserveridentity">true</prop>
            <prop key="mail.smtps.ssl.trust">*</prop> -->
        </props>
   </property>
</bean>

真的
5000
真的
真的
UTF-8
真的
真的
465
javax.net.ssl.SSLSocketFactory
真的
真的
真的

从开发日志进行SMTP调试：

354 End data with <CR><LF>.<CR><LF>
..
From: Test User <testuser@mydomain.com>
To: princess_yvonne@gmail.com
Message-ID: <1833254786.2.1468329021927.JavaMail.local@Yvonne-Koks-MacBook-  Pro.local>
Subject: Acknowledgement
MIME-Version: 1.0

354使用结束数据。
..
发件人：测试用户
致：公主_yvonne@gmail.com
消息ID:
主题：确认
MIME版本：1.0

从prod（smtp和smtps在同一位置失败，并出现相同错误）

数据
354使用结束数据。
发送、关闭、抛出时调试SMTP:IOException：
java.net.ConnectException:在的java.net.PlainSocketImpl.socketConnect（本机方法）上拒绝连接
java.net.AbstractPlainSocketImpl.doConnect（AbstractPlainSocketImpl.java:339）java.net.AbstractPlainSocketImpl.connectToAddress（AbstractPlainSocketImpl.java:200）java.net.AbstractPlainSocketImpl.connect（AbstractPlainSocketImpl.java:182）java.net.socksocketimpl.connect（socksocketimpl.java:392）java.net.Socket.Socket.connect（Socket.java:579）java:182）sun.net.www.http.HttpClient.openServer（HttpClient.java:527）上的sun.security.ssl.ssl.SSLSocketImpl.connect（SSLSocketImpl.java:160）上的sun.net.NetworkClient.doConnect（NetworkClient.java:180）上的sun.security.ssl.ssl.ssl.SSLSocketImpl.connect（SSLSocketImpl.java:625）在sun.net.www.protocol.https.HttpsClient.（HttpsClient.java:275）在sun.net.www.protocol.https.HttpsClient.New（HttpsClient.java:371）在sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient（AbstractDelegateHttpsURLConnection.java:191）在sun.net.www.protocol.http.HttpURLConnection（HttpURLConnection.java:933）上在sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect（AbstractDelegateHttpsURLConnection.java:177）在sun.net.www.protocol.http.HttpURLConnection.getInputStream（HttpURLConnection.java:1301）在sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream（HttpsURLConnectionImpl.java:254）上在org.springframework.core.io.UrlResource.getInputStream（UrlResource.java:168）在org.springframework.mail.javamail.MimeMessageHelper$1.getInputStream（MimeMessageHelper.java:1093）在javax.activation.DataHandler.writeTo（DataHandler.java:305）在javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:1485）上javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:865）javax.mail.internet.MimeMultipart.writeTo（MimeMultipart.java:462）com.sun.mail.handlers.multipart\u mixed.writeTo（multipart\u mixed.java:103）javax.activation.ObjectDataContentHandler.writeTo（DataHandler.java:889）javax.activation.DataHandler.writeTo（DataHandler.java:317）在javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:1485）在javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:865）在javax.mail.internet.MimeMultipart.writeTo（MimeMultipart.java:462）在com.sun.mail.handlers.multipart_mixed.writeTo（multipart_mixed.java:103）在javax.activation.ObjectDataContentHandler.writeTo（DataHandler.java:889）在javax.activation.DataHandler.writeTo（DataHandler.java:317）在javax.mail.internet.MimeBodyPart.writeTo（MimeBodyPart.java:1485）在javax.mail.internet.MimeMessage.writeTo（MimeMessage.java:1773）在com.sun.mail.smtp.SMTPTransport.sendmage（SMTPTransport.java:1119）上在org.springframework.mail.javamail.JavaMailSenderImpl.doSend（JavaMailSenderImpl.java:433）在org.springframework.mail.javamail.JavaMailSenderImpl.send（JavaMailSenderImpl.java:345）在org.springframework.mail.javamail.JavaMailSenderImpl.senderimpl.send（JavaMailSenderImpl.java:340）上

我已经穷尽了寻找确切的问题。虽然有连接被拒绝的例子，但我注意到没有一个是在354之后出现的，当时与smtp服务器在同一个框中

非常感谢您的帮助，请提前！

摆脱此问题

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您是否将URLDASURCE用于您发送的邮件的部分内容？当JavaMail尝试访问您邮件的部分内容时，连接将被删除，这需要到某个服务器的https连接。正是https连接被删除，导致SMTP连接被删除。

@bill shannon正确地指出了这一点。这确实是一个png图像的URLResource问题。我将其更改为ServletContextResource，并且它正在工作。 希望有人会觉得这很有用，从而节省沮丧和时间。

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特别感谢Bill Shannon把它钉得如此正确！！！

你确实是对的@Bill Shannon，100%正确。我将该URLResource更改为ServletContextResource，它开始工作。你拯救了我的一周，让我度过了美好的一天。非常感谢你。上帝保佑！！！

DATA
354 End data with <CR><LF>.<CR><LF>
DEBUG SMTP: IOException while sending, closing, THROW:
java.net.ConnectException: Connection refused at        java.net.PlainSocketImpl.socketConnect(Native Method) at     
java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)at     java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:625) at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:160) at sun.net.NetworkClient.doConnect(NetworkClient.java:180) at sun.net.www.http.HttpClient.openServer(HttpClient.java:432) at sun.net.www.http.HttpClient.openServer(HttpClient.java:527) at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:275) at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371) at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191) at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:933) at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1301) at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254) at org.springframework.core.io.UrlResource.getInputStream(UrlResource.java:168) at org.springframework.mail.javamail.MimeMessageHelper$1.getInputStream(MimeMessageHelper.java:1093) at javax.activation.DataHandler.writeTo(DataHandler.java:305) at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1485) at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:865) at javax.mail.internet.MimeMultipart.writeTo(MimeMultipart.java:462) at com.sun.mail.handlers.multipart_mixed.writeTo(multipart_mixed.java:103) at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:889) at javax.activation.DataHandler.writeTo(DataHandler.java:317) at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1485) at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:865) at javax.mail.internet.MimeMultipart.writeTo(MimeMultipart.java:462) at com.sun.mail.handlers.multipart_mixed.writeTo(multipart_mixed.java:103) at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:889) at javax.activation.DataHandler.writeTo(DataHandler.java:317) at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1485) at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1773) at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1119) at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:433) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:345) at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)