Crowd cannot send test email because of socket read timeout error

[Dai Zhang]

I configured Crowd outgoing mail with UI or JNDI method. However both didn't work.

The logs are listed below:

```

DEBUG: setDebug: JavaMail version 1.6.2 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 "smtp.test.cn", port 587, isSSL false 220 n212-142-139 ESMTP ready DEBUG SMTP: connected to host "smtp.test.cn", port: 587 EHLO 75ef36adabd8 250-n212-142-139 250 STARTTLS DEBUG SMTP: Found extension "STARTTLS", arg "" STARTTLS 220 2.0.0 Start TLS EHLO 75ef36adabd8 250-n212-142-139 250 AUTH PLAIN LOGIN DEBUG SMTP: Found extension "AUTH", arg "PLAIN LOGIN" DEBUG SMTP: protocolConnect login, host=smtp.test.cn, user=crowd@test.tech, password= DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM XOAUTH2 DEBUG SMTP: Using mechanism LOGIN DEBUG SMTP: AUTH LOGIN command trace suppressed DEBUG SMTP: AUTH LOGIN succeeded DEBUG SMTP: use8bit false MAIL FROM:

250 2.0.0 Roger, accepting mail from RCPT TO:

250 2.0.0 I'll make sure gets this DEBUG SMTP: Verified Addresses DEBUG SMTP: mail@test.tech DATA 354 2.0.0 Go ahead. End your data with .

QUIT DEBUG SMTP: exception reading response, THROW:

java.net.SocketTimeoutException: Read timed out

at java.base/java.net.SocketInputStream.socketRead0(Native Method)

at java.base/java.net.SocketInputStream.socketRead(SocketInputStream.java:115)

at java.base/java.net.SocketInputStream.read(SocketInputStream.java:168)

at java.base/java.net.SocketInputStream.read(SocketInputStream.java:140)

```

according to the [suggestions online](https://stackoverflow.com/questions/71272796/javamail-sends-no-content-with-smtp-sends-quit-and-hangs), I switched the javamail to version 1.6.4 or 1.6.5 or downgraded it to 1.6.1. However, the mail still cannot be sent out.

How to fix it. Thanks.

[Dai Zhang]

contacting the backend smtp service provider, and they said the connection broke when sending 6 bytes in DATA stage. The mail server side could only read out 6 bytes then wait until timeout.

[Dai Zhang]

It seems the crowd application does not send the SMTP commands correctly. How to debug it and fix it.

[Rinat Vafin]

Hello. Have you find solution for this issue? I'm getting same behavious on using gmail smtp (and some other public relays).