On Mon, Feb 04, 2008 at 04:26:10PM +0200, Johann Spies
wrote:> pkg-exim4-users at lists.alioth.debian.org
> SMTP error from remote mail server after RCPT TO:<pkg-exim4-users at
lists.alioth.debian.org>:
> host lists.alioth.debian.org [217.196.43.134]:
> 550-Verification failed for <prvs=jspies/092037e01f at sun.ac.za>
> 550-Called: 146.232.64.13
> 550-Sent: RCPT TO:<prvs=jspies/092037e01f at sun.ac.za>
> 550-Response: 550 restricted characters in address
> 550 Sender callout failed: Sender adress can''t be verified trough
SMTP check.
# The following section of the ACL is concerned with local parts that contain
# certain non-alphanumeric characters. Dots in unusual places are
# handled by this ACL as well.
#
# Non-alphanumeric characters other than dots are rarely found in genuine
# local parts, but are often tried by people looking to circumvent
# relaying restrictions. Therefore, although they are valid in local
# parts, these rules disallow certain non-alphanumeric characters, as
# a precaution.
#
# Empty components (two dots in a row) are not valid in RFC 2822, but Exim
# allows them because they have been encountered. (Consider local parts
# constructed as "firstinitial.secondinitial.familyname" when
applied to
# a name without a second initial.) However, a local part starting
# with a dot or containing /../ can cause trouble if it is used as part of a
# file name (e.g. for a mailing list). This is also true for local parts that
# contain slashes. A pipe symbol can also be troublesome if the local part is
# incorporated unthinkingly into a shell command line.
#
# These ACL components will block recipient addresses that are valid
# from an RFC2822 point of view. We chose to have them blocked by
# default for security reasons.
#
# If you feel that your site should have less strict recipient
# checking, please feel free to change the default values of the macros
# defined in main/01_exim4-config_listmacrosdefs or override them from a
# local configuration file.
#
# Two different rules are used. The first one has a quite strict
# default, and is applied to messages that are addressed to one of the
# local domains handled by this host.
# The default value of CHECK_RCPT_LOCAL_LOCALPARTS is defined in
# main/01_exim4-config_listmacrosdefs:
# CHECK_RCPT_LOCAL_LOCALPARTS = ^[.] : ^.*[@%!/|`#&?]
# This blocks local parts that begin with a dot or contain a quite
# broad range of non-alphanumeric characters.
.ifdef CHECK_RCPT_LOCAL_LOCALPARTS
deny
domains = +local_domains
local_parts = CHECK_RCPT_LOCAL_LOCALPARTS
message = restricted characters in address
.endif
# The second rule applies to all other domains, and its default is
# considerably less strict.
# The default value of CHECK_RCPT_REMOTE_LOCALPARTS is defined in
# main/01_exim4-config_listmacrosdefs:
# CHECK_RCPT_REMOTE_LOCALPARTS = ^[./|] : ^.*[@%!`#&?] : ^.*/\\.\\./
# It allows local users to send outgoing messages to sites
# that use slashes and vertical bars in their local parts. It blocks
# local parts that begin with a dot, slash, or vertical bar, but allows
# these characters within the local part. However, the sequence /../ is
# barred. The use of some other non-alphanumeric characters is blocked.
# Single quotes might probably be dangerous as well, but they''re
# allowed by the default regexps to avoid rejecting mails to Ireland.
# The motivation here is to prevent local users (or local users''
malware)
# from mounting certain kinds of attack on remote sites.
.ifdef CHECK_RCPT_REMOTE_LOCALPARTS
deny
domains = !+local_domains
local_parts = CHECK_RCPT_REMOTE_LOCALPARTS
message = restricted characters in address
.endif
(this has been taken verbatim from Debian exim4''s default
configuration).
If you have any more questions after reading this documentation,
please ask again.
Greetings
Marc
--
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