Tran Hong Quan created JAMES-4066:
-------------------------------------

             Summary: EHLO is too strict
                 Key: JAMES-4066
                 URL: https://issues.apache.org/jira/browse/JAMES-4066
             Project: James Server
          Issue Type: Bug
          Components: SMTPServer
            Reporter: Tran Hong Quan



```
{
    "timestamp": "2024-08-28T13:24:32.938Z",
    "level": "ERROR",
    "thread": "smtpserver-global-2",
    "mdc": {
        "charset": "US-ASCII",
        "action": "EHLO",
        "sessionId": "3e0480cc"
    },
    "logger": "org.apache.james.protocols.smtp.core.esmtp.EhloCmdHandler",
    "message": "Invalid EHLO argument received: 7kO2OrE. Must be a domain name 
or an IP address.",
    "context": "default"
}
```


Coming from a legitimate user and preventing legitimate users from sending 
mails...

IMO we can relax EHLO to accept inputs made only of a-z,A-Z,0-9 characters in 
addition to the currently accepted value.






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