-$Cambridge: exim/doc/doc-misc/WishList,v 1.8 2004/11/24 15:04:11 ph10 Exp $
+$Cambridge: exim/doc/doc-misc/WishList,v 1.34 2005/05/31 11:31:30 ph10 Exp $
EXIM 4 WISH LIST
----------------
particular, it would allow failing of certain 4xx codes.
This is now available for 4xx responses to RCPT commands. Is anything more
-needed?
+needed? Apparently, yes; there's been a request for a similar feature for MAIL
+commands.
------------------------------------------------------------------------------
(148) 15-May-2000 S Warn recipient if message rejected for quota excession.
seem not (you don't often get two addresses to the same user).
------------------------------------------------------------------------------
-(4) 01-Jan-02 S Option to reject if no From: or Date: header line
-
-Exim, in common with many other MTAs, inserts a From: or Date: header line if
-one is missing. (It also inserts a blank Bcc:, but that is no longer needed by
-RFC 2822 - it was by 822.) The suggestion is an option to give an error
-instead. This could be done by making it possible to detect these insertions in
-the acl_smtp_data ACL.
-------------------------------------------------------------------------------
-
(6) 01-Jan-02 S Option to disable the use of -t
Dave C.
host, send AUTH/ATRN, and then accept incoming messages as usual.
------------------------------------------------------------------------------
-(50) 22-May-02 T Add comment (duplicate address) to Envelope-To:
+(50) 22-May-02 S? Add comment (duplicate address) to Envelope-To:
-This is just to minimize the confusion some people have.
+This is just to minimize the confusion some people have. However, it is not
+trivially easy to decide which to label as duplicates because of complications
+with redirection. I'm not convinced it will actually reduce confusion.
------------------------------------------------------------------------------
(51) 07-Jun-02 S Option to use another address in callout MAIL FROM
22-Apr-04: Implemented for domains, addresses, and local parts. Hosts are
too messy!
+
+The only sensible approach seems to be to allow IP address arguments only.
+Anything else should be diagnosed as an error. However, if a name appears in
+the list, a PTR lookup should be done. This may require a lot of refactoring
+in the code, because of the current assumption that were are (almost) always
+dealing with THE sending host.
------------------------------------------------------------------------------
(74) 22-Jul-02 M Extend -bV to do more semantic checking
------------------------------------------------------------------------------
(202) 10-Oct-03 S -bvsomething to do a callout after the verify
+
+For example: -bvc and -bvsc. The problem now (Nov 04) is that there are quite a
+few possible callout options that can be specified in an ACL, and they would
+have to be replicated here.
------------------------------------------------------------------------------
(203) 14-Oct-03 S verify=something to easily check for header presence
(215) 14-Nov-03 S A way of turning off message-submission fix-ups
Globally, and perhaps also via an ACL control so that it can be done on a
-per-message basis.
+per-message basis. Is this still needed? Since this item was added to this
+list, default fixups for non-local messages have been removed, and control =
+submission has been added.
------------------------------------------------------------------------------
(215) 26-Nov-03 M/L Conversion of IDNA domain names for logging
------------------------------------------------------------------------------
(223) 22-Dec-03 S Support SOA lookup in dnsdb lookups
+
+This could be like zns, and climb up the tree till it hits a zone. Would the
+name of the zone be required?
------------------------------------------------------------------------------
(225) 22-Dec-03 M Add acl= to routers
(230) 30-Jan-04 M Find IP addresses of a domain's nameservers
This needs some way of processing a list of things in a similar way, which
-should perhaps be a more general facility.
+should perhaps be a more general facility. // This can now be done using the
+list facilities of dnsdb; verbose, but it can be done. //
------------------------------------------------------------------------------
(231) 30-Jan-04 ? -C has a number of problems when used for real
(235) 02-Feb-04 T Make smtp_accept_count available as a variable
This is for use in ACLs. Of course, it is a snapshot of the count at the
-start of the receiving process.
+start of the receiving process. As such, it could be confusing because if a
+connection lasts a long time, the "true" value could be very different. For
+this reason, I don't really like this idea.
------------------------------------------------------------------------------
(236) 02-Feb-04 S String in local_scan that's added to the binary version string
(240) 23-Feb-04 ? Some way to know if a ip is a mx for a given domain
Some kind of iterative operation for dnsdb might be a general way of providing
-this.
+this. // This can now be done using the list facilities of dnsdb; verbose, but
+it can be done. //
------------------------------------------------------------------------------
(242) 01-Mar-04 ? Run a filter from an expansion condition
Given that pids are reused non-cyclically these days, is this actually useful?
------------------------------------------------------------------------------
-(269) 26-May-04 U Run both a system and a user filter in test mode
-
- exim -bF systemfilter -bf userfilter -f sender@dom < message
-
-This would allow testing the way the userfilter handles the system
-variables set by the systemfilter.
-------------------------------------------------------------------------------
-
(270) 01-Jun-04 M Add headers at top and middle
Various initiatives like SPF and DomainKeys require header lines to be added
(280) 23-Jun-04 M A way of adding a header line after callout defer_ok
This would record that, e.g., a sender domain verified, but the callout
-could not be done.
+could not be done. There are ways of fudging this, using ACL variables and
+"warn" statements.
------------------------------------------------------------------------------
(285) 16-Jul-04 M Separate and independent log_selector for rejectlog
AUTH during the callout checking, on all types of connection. I suppose that
means making TLS available as well. This probably means a rewrite of the code
that actually does the callout. Should we use the relevant transport in a new
-"callout" mode instead of keeping things separate? See also 253.
+"callout" mode instead of keeping things separate? See also 253 and 323.
And here's another submitted idea: "My actual suggestion is that if this model
is followed, the parent process doesn't have to stop the callout process if it
What about ** lines?
------------------------------------------------------------------------------
-(298) 25-Oct-04 S Debugging the daemon process only
-
-When there are daemon problems (e.g. it dies) it would be helpful to be able to
-turn on debugging that did not get passed on to any subprocesses.
-------------------------------------------------------------------------------
-
(299) 25-Oct-04 S Options to make Sieve "keep" pass to next router
Currently, "keep" saves in the mailbox. Probably need two options, for implicit
and explicit keep commands.
------------------------------------------------------------------------------
-(300) 25-Oct-04 S Option to lock out Sieve or Exim filter
-
-Currently, if allow_filter is set, either kind of filter is permitted.
-------------------------------------------------------------------------------
-
(301) 27-Oct-04 M Use an "ACL" to filter logging
This idea was for ACL syntax to be able to "accept" or "deny" individual log
This could be added to "verify=header_syntax" or, if the incompatibility is
felt to be too great, an additional condition, or a sub-option, could be added.
------------------------------------------------------------------------------
---- HWM 307 ------------------------------------------------------------------
+
+(308) 24-Nov-04 S Add $body_longlinecount and $header_longlinecount
+
+These variables would hold the number of physical lines in the body and header
+that were longer than 998 bytes. This would be fiddly to implement because of
+the way Exim currently reads the input. It isn't just a trivial patch.
+------------------------------------------------------------------------------
+
+(309) 01-Dec-04 S/M Queue runners should get locks before forking
+
+If a queue-runner opened the -D file and took out the lock before forking, it
+would waste fewer resources if the message was already being delivered. But how
+often would this actually matter in practice?
+------------------------------------------------------------------------------
+
+(310) 06-Dec-04 S After "personal" save what matched
+
+The idea is to save the email address that actually was found in the message
+in a variable so it can be used (e.g. as the From: address in an autoreply).
+------------------------------------------------------------------------------
+
+(311) 07-Dec-04 ? More flexible SMTP response codes
+
+The requestor wanted to be able to specify, for example, 551 in an ACL deny
+instead of 550, and also vary the defer code. The first digit, however, should
+remain fixed. In addition to main codes, enhanced status codes (RFC 2034) were
+requested. (As far as I can tell, they have never been highly popular.)
+------------------------------------------------------------------------------
+
+(312) 10-Dec-04 ? Shadow remote transports
+
+Unless a lot of work is done, this would be restricted to another remote
+transport. A similar effect could therefore be achieved with "shadow_hosts"
+which are like fallback_hosts but which operate on success.
+------------------------------------------------------------------------------
+
+(313) 21-Jan-05 ? Multiple queues
+
+Exim runs poorly if its queue gets too big. Various ways round this are all
+to some extent kludges. There has been a suggestion of using multiple
+directories instead of just "input". (Originally it was for a whole set of
+spool directories, but that introduces complications with the hint files.)
+On message arrival, somehow a selection of "input" must be made. Then queue
+runners must be startable for the different "queues". Don't forget that the
+"msglog" directory is also involved. Perhaps add a new level of indirection:
+/var/spool/exim/queue1/{input,msglog}, /var/spool/exim/queue2/....
+------------------------------------------------------------------------------
+
+(314) 15-Feb-05 M Multiple headers_{add,remove} for routers
+
+If headers_{add,remove} could be specified multiple times, it would be easier
+for those people that construct configs using .ifdef or .include, etc.
+------------------------------------------------------------------------------
+
+(315) 15-Feb-05 M String variables for use in filters.
+
+Currently, only numerical variables are supported.
+------------------------------------------------------------------------------
+
+(316) 21-Feb-05 M Put callout response into a variable
+
+When a callout fails, put the entire SMTP response into a variable. This is not
+trivial because we probably should retain it in the cache as well.
+------------------------------------------------------------------------------
+
+(317) 25-Feb-05 S Delete the pid file when the daemon exits
+
+At least try to catch some of the exit routes from the daemon and either delete
+or empty the pid file.
+------------------------------------------------------------------------------
+
+(318) 02-Mar-05 S Add current connection count to daemon's exiwhat output
+------------------------------------------------------------------------------
+
+(319) 03-Mar-05 ? Allow file rather than directory for scanning call
+
+"I can call arbitrary scanning software by specifying the full path. I can pass
+a directory to be scanned in the arguments. I'd like to be able to pass a
+specific file name instead of a directory. I think this would allow me to call
+Bogofilter at smtp time. Bogofilter requires a filename, not a directory. The
+file would contain the complete email. I suppose there may be other scanning
+solutions with a similar requirement."
+------------------------------------------------------------------------------
+
+(320) 03-Mar-05 T Options to control daemon retry binding
+
+Currently the daemon tries 10 times at 30-second intervals to listen on an IP
+address. The wish is for options to control these numbers.
+------------------------------------------------------------------------------
+
+(321) 07-Mar-05 S Run an ACL on a sync error
+
+... and possibly "accept" or "deny" it.
+------------------------------------------------------------------------------
+
+(322) 15-Mar-05 M Add a /defer_ok option to verify=reverse_host_lookup
+------------------------------------------------------------------------------
+
+(323) 15-Mar-05 M Make callouts use smtp_data from the smtp transport
+
+This is yet another problem caused by duplicating the SMTP code between the
+transport and the callout verification. See item 294 above. Merging the
+transport and the callout code could prevent this kind of thing from happening.
+------------------------------------------------------------------------------
+
+(324) 04-Apr-05 ? Make -bP show ACLs
+
+This is in the Bugzilla as #10.
+------------------------------------------------------------------------------
+
+(325) 28-Apr-05 ? Support for quotas over 2G in appendfile.
+
+Things get bigger far more quickly than I ever imagine...
+------------------------------------------------------------------------------
+
+(326) 03-May-05 ? Queue-only on memory shortage
+
+This is bugzilla #17. The idea is to have something like queue_only_load that
+triggers on a shortage of main memory.
+------------------------------------------------------------------------------
+
+(327) 06-May-05 ? Break delay if connection drops
+
+Currently, "delay=5m" (e.g.) waits for 5 minutes. If we can detect that the
+connection has died in the meantime, it would make sense to break the delay.
+However, it doesn't seem possible to detect a dropped connection without trying
+to read from it.
+------------------------------------------------------------------------------
+
+(328) 10-May-05 S After "unseen" routing, pass on header additions/deletions
+
+Currently, when an "unseen" router accepts an address, header additions and
+deletions stick with that address, and the "clone" address that continues to be
+routed starts off without any additions or removals. This request is for an
+option to select other actions: retain header actions with the clone only, or
+pass them on to both addresses.
+------------------------------------------------------------------------------
+
+(329) 12-May-05 S Create message ID at MAIL FROM time
+
+Currently, the ID is created only when Exim is about to create the data (-D)
+file for an incoming message. In other words, after it knows it really is going
+to accept the message. Creating the ID earlier would mean that rejection
+messages in the log would be tagged with an ID, and this is seen as desirable
+by some people.
+------------------------------------------------------------------------------
+
+(330) 31-May-05 ? Default interface for -bh and default port for -oMi
+
+I do not think it worth putting effort in here for these reasons: If a host has
+multiple interfaces, there's no easy way to choose one to be the default for
+$interface_address when -bh is used. If the host does not have multiple
+interfaces, chances are the configuration won't be looking at
+$interface_address anyway. If you are setting -oMi, and care about the port, it
+isn't much effort to tack on a port number, though in this case, I suppose a
+default of 25 is "obvious".
+------------------------------------------------------------------------------
+
+(331) 31-May-05 M More than one retry time per host
+
+Consider this example: an attempt to start a TLS connection to a host gets a
+temporary error. This stops *all* connections, both for TLS and otherwise.
+Different retry times for different circumstances are needed to get round this.
+What are the circumstances? TLS/not-TLS is clearly one, but sometimes you don't
+know if you are going to try TLS until you have connected. So this makes sense
+only if require_tls is used. Perhaps the multiple retry times should just be
+per-transport, to avoid these difficulties. If we made all retry keys depend on
+the transport, this would happen automatically.
+------------------------------------------------------------------------------
+--- HWM 331 ------------------------------------------------------------------
---------------------------- End of WishList ---------------------------------
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