- dovecot - dovecot.org

RE: [Dovecot] Hooks on folder operations
by Maikel Verheijen 23 Jul '03

23 Jul '03

Hi Grahame, > Hi all, > > I'm interested in implementing an anti-spam system using > bayesian filtering. I had the idea of modifying and IMAP > server to assist in training the spam filter. Why do you want to hook it up into your imap server? I think it would be better to prevent emails to enter the mailbox with the MTA rather than removing it when the user is reading his email using imap. Why? Because the spam that is in the mailbox might push the user over his quota limit, and thus preventing legitimate emails to be delivered. > I was thinking of running a program whenever a message in > moved to the folder "Spam" or to a "Safe" folder. This could > be easily added to the server as a generic feature, with hook > programs for: > * new message in a folder (either new, or moved into the folder) > * message in folder is modified > * message in folder is removed > and so on. If the support was generic enough there could be > many uses for it. Security of the external program needs to > be considered but doesn't really affect the IMAP server itself. With the new API code that Timo is making now, I guess this would be possible. (After all: if quota's are updated, something was written to the mailbox, or deleted of course!) > Anyway, if I were to write a patch to add support for running > an external program in these cases, would it be included? Any > feedback would be appreciated, if I'm going to do this I > might as well do it in a way that can be integrated back into > the main tree! You can always build a plugin, and plugins can be loaded whenever an administrator wants them to load. I don't know if Timo wants to include all plugins that are / will be written for dovecot, but I guess there might be a plugins part, where people can "post" their plugins so other people can benefit from them :) > Cheers > Grahame Kind regards, Maikel Verheijen

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[Dovecot] Courier's IMAP custom flags implementation
by Timo Sirainen 23 Jul '03

23 Jul '03

Just thought to mention: http://dovecot.procontrol.fi/tmp/README.imapkeywords.html I'm not sure what to think of it. Good thing in it is that it doesn't limit the number of flags. Bad thing is that I think it's way too slow. Compared to Dovecot's implementation where I "steal" maildir flags a..z and treat them in the normal maildir way. Bad thing is obviously that it's limited to 26 different flags. And I really should fix that customflags file soon to be NFS-safe / read-lockless. It's just a bit problematic how to handle removing unused flags when you've hit the 26 limit and try to add new ones.

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[Dovecot] Hooks on folder operations
by Grahame Bowland 23 Jul '03

23 Jul '03

Hi all, I'm interested in implementing an anti-spam system using bayesian filtering. I had the idea of modifying and IMAP server to assist in training the spam filter. I was thinking of running a program whenever a message in moved to the folder "Spam" or to a "Safe" folder. This could be easily added to the server as a generic feature, with hook programs for: * new message in a folder (either new, or moved into the folder) * message in folder is modified * message in folder is removed and so on. If the support was generic enough there could be many uses for it. Security of the external program needs to be considered but doesn't really affect the IMAP server itself. Anyway, if I were to write a patch to add support for running an external program in these cases, would it be included? Any feedback would be appreciated, if I'm going to do this I might as well do it in a way that can be integrated back into the main tree! Cheers Grahame -- Grahame Bowland Email: grahame(a)ucs.uwa.edu.au University Communications Services Phone: +61 8 9380 1175 The University of Western Australia Fax: +61 8 9380 1109 CRICOS: 00126G

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[Dovecot] Imap 2 imap copy tool?
by Maikel Verheijen 23 Jul '03

23 Jul '03

Hi List! At the moment, our company is preparing to migrate from MS-Exchange to a dovecot mail platform. Since there is no way to access the emails on the file-store other than using webmail, pop or imap, I wanted to do this by using an imap-to-imap copy tool. I have found one that does the job (but POORLY), named migrate (http://prdownloads.sourceforge.net/cyrus-utils/) Does anyone know some other tool(s) for me I could have a look at? My requirements for such software are: - it should use a username;password list to do the migration (20k+ users) - it should be able to do imap to imap copy, or imap to maildir with a flexible path - it should copy all the folders too, except the "Public Folders" from exchange. - it has to be able to "ignore" unknown flags from the exchange imap server (\Recent). What I would love the software to have (and what imapmigrate lacks): - Folder and message syncing (to be able to keep the mailbox in sync) - detailed errors if something goes wrong, not too much fuss over accounts that DO get copied cleanly - fast tool? :) Thank you for your time! Kind regards, Maikel Verheijen.

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[Dovecot] hierarchy_sep
by molter＠tin.it 22 Jul '03

22 Jul '03

Hi Timo, I would like to add another naming scheme to dovecot to recognize maildir folders: As of today: ~/Maildir/.foo ~/Maildir/.foo.bar I would like to add: ~/Maildir/foo ~/Maildir/foo/bar I had a quick look at the code (very clean, I am impressed!) and I saw struct mail_storage, with field hierarchy_sep. I think I cannot just set hierarchy_sep to '/', because /foo would start from the root of the filesystem instead of being relative to ~/Maildir. Do you have any suggestions on the cleaner way of doing it? Or maybe do you think it is wrong to depart from '.' for some reason? thanks Marco

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RE: [Dovecot] Loadable module
by Maikel Verheijen 22 Jul '03

22 Jul '03

Hi Timo, [snipped possible scenario's] > OK. 3) is the best idea :) But it requires a few changes to > make it work. I wouldn't expect it to work out of the box :) But if I read your suggestions right, you propose a "fixed" change in the maildir functions that call the quota update functions if necessary. So perhaps we should make a quota_enabled = yes|no flag int the config file, and use that? I would still be trying to make the quota update functions for you, and try to put them in. > Actually, I think this is exactly how I want quota and ACLs > to be implemented. No extra interface changes for either one of them. > > For quota, you'd want to do something like: > > expunge(): nothing special, just update the quota file after expunges Expunge should recalculate the whole mailfolder? > save_next(): Check data istream's size and if it's over quota, fail. Ok. So this one can be "easy". Just check if mailsize + current usage < max_quota. :) > copy(): this is somewhat problematic, if there wasn't the > maildir hardlinks you wouldn't have to touch it at all.. A copy can duplicate a message in the same store, but do hardlinks work on nfs? If not, we should add the message to the quota list. And maybe we should just add size of the email anyway, it won't be that much of a loss to the user, and it would save us a lot of checking. :) And how about a user that has no quota file (yet), can we "recreate" them? Maybe do a quota lookup for the user (database or file)? This can be done using a module I guess, so it could be "user configurable". Regards, Maikel Verheijen.

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[Dovecot] Outlook Express 6.0.280.1123 SSL and dovecot .
by Xavier Beaudouin 22 Jul '03

22 Jul '03

Hello there, First many thanks for dovecot, this is marvelous piece of software :) One of my users is using Outlook Express 6.0.280.1123 on XP with SSL. I have lots of this in the syslog : Jul 22 16:25:31 kiwi imap-login: Login: fptarget [62.4.1.170] Jul 22 16:25:32 kiwi imap-login: SSL_read() syscall failed: EOF [62.4.1.170] Jul 22 16:25:59 kiwi imap-login: SSL_read() syscall failed: EOF [62.4.1.170] Jul 22 16:26:43 kiwi imap-login: Login: fptarget [62.4.1.170] Jul 22 16:26:45 kiwi imap-login: SSL_read() syscall failed: EOF [62.4.1.170] Jul 22 16:26:47 kiwi imap-login: Login: fptarget [62.4.1.170] Jul 22 16:26:48 kiwi imap-login: SSL_read() syscall failed: EOF [62.4.1.170] Is there any way to avoid that ? (except telling this user to stop using outlook ?). Thanks, /Xavier

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RE: [Dovecot] Loadable module
by Maikel Verheijen 22 Jul '03

22 Jul '03

Hi Timo, When you have time to create the hooks to the various locations within dovecot, I am willing to try to make a module to support Maildir quota's. Would that be possible with the hooks, and can that be done using a plugin as well? Kind regards, Maikel Verheijen. > -----Original Message----- > From: Timo Sirainen [mailto:tss@iki.fi] > Sent: Saturday, July 19, 2003 12:14 AM > To: Maikel Verheijen > Cc: 'dovecot(a)procontrol.fi' > Subject: Re: [Dovecot] Loadable module > > > On Saturday, Jul 19, 2003, at 00:40 Europe/Helsinki, Maikel Verheijen > wrote: > > > I read a post about moving a .mailbixlist to a > .subscriptionfile when > > a user did not have one, but did have a .mailboxlist file. Timo > > emailed a module for that purpose, so it could be done for > this user. > > > > My question is: > > > > - Where and how does dovecot call this function? > > <module name>_init(); is called after initializing Dovecot's > core code, > but before opening any message store or creating client structure. I > think I'd have to add some hooks for store creation and > client creation > so you wouldn't need kludges if you want to modify them in some way. > > You'll have to enable modules of course in configuration file > and place > the module to right directory. > > > - Would it be easy to use a module to a) create a mailpath (can be > > done as the mailuser's id, I use one uid, and my path is > all owned by > > that uid), and b) simply remove a quota file? > > Yes, the modules can do whatever they want. Just use mkdir() and > unlink(). >

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[Dovecot] migrating from uw imapd
by Craig 21 Jul '03

21 Jul '03

Hi, I'm trying to migrate from uw imapd to dovecot. I'm having two problems at the moment. 1. uw imapd grabs new mail from /var/mail/user and then shoves it into ~/mbox, is there any way to make dovecot handle this kind of setup or am I better off merging ~/mbox back into /var/mail/user? If merging is better are what tools are best for this? 2. While I did have have everything in ~/Mail coming up dovetail stopped working and logs the following error: syslog:Jul 19 23:01:07 epsilon3 imap-login: Login: haakon [192.168.0.107] syslog:Jul 19 23:01:07 epsilon3 imap(haakon): Failed to create storage with data: ~/Mail/:INBOX=/var/mail/haakon syslog:Jul 19 23:01:07 epsilon3 dovecot: child 10417 (imap) returned error 89 any idea what is causing this? Regards, Craig.

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Re: [Dovecot] How to use SASL2?
by Matthew Reimer 19 Jul '03

19 Jul '03

Timo Sirainen wrote: > On Fri, 2003-07-18 at 02:02, grpmind+dovecot(a)boromir.vpop.net wrote: > >>How does one use SASL2 for authentication? I looked for docs but found >>none. > > There's some code for supporting Cyrus' SASL library, but it hasn't been > tested for a while and I doubt that it works. I don't really have plans > to make it work either. > > Why do you want it anyway? Dovecot supports PLAIN, DIGEST-MD5 and > ANONYMOUS SASL mechanisms internally. Most important missing one is > Kerberos 5 I think. I'm not really interested in using SASL for its own sake, but because it's a way to get dovecot to authenticate against my mysql users db. I might try to write a patch to implement mysql support for dovecot, hopefully good enough for you to commit. Matt

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