spring.mail.host=smtp.qq.com
spring.mail.port=25
spring.mail.username=huhao
spring.mail.from=xxx@qq.com
spring.mail.password=xxxxx
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true
spring.mail.properties.mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory

Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at sun.security.ssl.Alert.createSSLException(Alert.java:131)
	at sun.security.ssl.TransportContext.fatal(TransportContext.java:353)
	at sun.security.ssl.TransportContext.fatal(TransportContext.java:296)
	at sun.security.ssl.TransportContext.fatal(TransportContext.java:291)
	at sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:652)
	at sun.security.ssl.CertificateMessage$T12CertificateConsumer.onCertificate(CertificateMessage.java:471)
	at sun.security.ssl.CertificateMessage$T12CertificateConsumer.consume(CertificateMessage.java:367)
	at sun.security.ssl.SSLHandshake.consume(SSLHandshake.java:376)
	at sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:444)
	at sun.security.ssl.HandshakeContext.dispatch(HandshakeContext.java:422)
	at sun.security.ssl.TransportContext.dispatch(TransportContext.java:183)
	at sun.security.ssl.SSLTransport.decode(SSLTransport.java:154)
	at sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1279)
	at sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1188)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:401)
	at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:373)
	at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:602)
	at com.sun.mail.util.SocketFetcher.startTLS(SocketFetcher.java:529)
	at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2135)
	... 10 common frames omitted
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
	at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:439)
	at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:306)
	at sun.security.validator.Validator.validate(Validator.java:271)
	at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:312)
	at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:221)
	at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:128)
	at sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:636)
	... 24 common frames omitted
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to reques