Bug#296132: exim4-config: suggest sender verification in default config

[Andreas Metzler]

On 2005-02-20 Jay Berkenbilt <ejb@ql.org> wrote:
> Package: exim4-config
> Version: 4.44-2
> Severity: wishlist

> I recently switched from sendmail to exim4 and have been quite happy
> with the results.  There is, however, one important feature that is
> present in the sendmail default config and not in the Debian exim4
> default config: sender domain verification.  On my fairly small site,
> we get hit with about one mesasge with an invalid sender domain every
> 15 seconds.
[...]
> acl_check_mail:
>   accept verify = sender
[...]

Quote from /etc/exim4/conf.d/acl/30_exim4-config_check_rcpt or
/etc/exim4/exim4.conf.template respectively:

  # Deny unless the sender address can be verified.
  #
  # This is disabled by default so that DNSless systems don't break. If
  # your system can do DNS lookups without delay or cost, you might want
  # to enable the following line.
  # deny message = Sender verification failed
  #      !acl = acl_whitelist_local_deny
  #      !verify = sender

</unquote>
                  cu andreas
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