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https://issues.apache.org/jira/browse/JAMES-3820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17609891#comment-17609891
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Benoit Tellier commented on JAMES-3820:
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>From what I could see we enforce empty sender when this happens IE <>...
Maybe more (integration) testing could be done on the topic, I agree. We need
to better understand the implications of this.
Can empty sender be used to relay emails with James while being
unauthenticated? (this would be bad, for sure... I am unsure such a corner case
is tested...)
Maybe as an admin I would need an option to require a proper MAIL FROM
explicitly ?
> DNS Blocklist: implement DNSRBLHandler as MailHook instead of RcptHook
> ----------------------------------------------------------------------
>
> Key: JAMES-3820
> URL: https://issues.apache.org/jira/browse/JAMES-3820
> Project: James Server
> Issue Type: Improvement
> Components: SMTPServer
> Reporter: ouvtam
> Priority: Minor
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> At the moment the DNSRBL handler
> (org.apache.james.protocols.smtp.core.fastfail.DNSRBLHandler) is implemented
> as a RcptHook. Thus, for every RCPT TO call this handler will be called and a
> blocklist lookup will be issued.
> One can argue It makes sense to implement the handler as a ConnectHandler, so
> the blocklist check is done as early as possible. However, if SMTP AUTH is
> successful then we should allow the connecting client anyway.
> Therefore it makes sense to implement the DNSRBL handler at MAIL FROM stage
> that is MailHook. One exception is the following. According to [RFC
> 4954|https://datatracker.ietf.org/doc/html/rfc4954#section-5], authentication
> information can optionally provided as ESMTP AUTH parameter with a _single_
> value in the '{{{}MAIL FROM:{}}}' command.
>
>
>
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