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https://issues.apache.org/jira/browse/JAMES-4066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17877574#comment-17877574
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Tran Hong Quan commented on JAMES-4066:
---------------------------------------
Postfix indeed supports that input.
{code:java}
hp@hp-quanth:~$ telnet localhost 41055
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 incoming.upn.integration-open-paas.org ESMTP Postfix (Ubuntu)
EHLO 7kO2OrE
250-incoming.upn.integration-open-paas.org{code}
> 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
> Priority: Major
>
> ```
> {
> "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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