-$Cambridge: exim/doc/doc-misc/WishList,v 1.15 2004/12/17 14:52:43 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
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.
+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
(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
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
transport. A similar effect could therefore be achieved with "shadow_hosts"
which are like fallback_hosts but which operate on success.
------------------------------------------------------------------------------
---- HWM 312 ------------------------------------------------------------------
+
+(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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