[Bug 227899] mail/opensmtpd: Backport smtp state machine bug fix

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227899

            Bug ID: 227899
           Summary: mail/opensmtpd: Backport smtp state machine bug fix
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: fluffy at FreeBSD.org
          Reporter: grembo at FreeBSD.org
          Assignee: fluffy at FreeBSD.org
             Flags: maintainer-feedback?(fluffy at FreeBSD.org)

Created attachment 192968
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=192968&action=edit
Backported patch from upstream

Backport a bug fix from upstream

https://github.com/OpenSMTPD/OpenSMTPD/commit/d5c50b04a521df881dc4eb53a4047b63857309e4#diff-7a3eeab700d4e5030a1be44aef0fee78

You can find a description of the problem here

https://www.mail-archive.com/misc@opensmtpd.org/msg03248.html

The bug addressed can lead to resource exhaustion (basically remote denial of
service) and also prevents emails without a body from getting delivered.

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