- dovecot - dovecot.org

convert mdbox to maildir
by lutz.niederer＠gmx.net 14 Aug '22

14 Aug '22

Hi! We need to move all users from one (pretty old) installation of dovecot to a new one. The old one uses mdbox for users' mailboxes and maildir for shared/public mailboxes. The new one must be maildir only. I believe that I can just copy the shared/public maildir structure to the new installation without problems. Am I right? Do I have to expect any trouble? (Set owner, permissions etc...) The real problem is that we must not use the running, old dovecot installation. So we are not able to connect to the old server, pull all folders and mails and create a new maildir structure. Currently, we can't do anything against it. What we get are the users' mdbox files. Is there any way to convert mdbox files and structures to maildir directly from filesystem? Or do we have to build a copy of the old machine (dovecot only, or -maybe better- a vm) and then use doveadm backup? Or is it ok to just set up the completely new installation, set mail_location to where the new Maildirs will be, like maildir:~/Maildir and then run something like doveadm backup mdbox:/tmp/$user/mdbox -u $user? Will this transfer all mails and folders or do we have to keep an eye on some specific things? I thank you very much and cheers! -lutzn

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Submission auth gssapi: line too long
by Carlos Mogas da Silva 14 Aug '22

14 Aug '22

Hey guys. Dovecot is complaining about a "Line too long" when the clients send the AUTH command with GSSAPI authentication. Known bug? # dovecot --version 2.3.19.1 (9b53102964) This is right after the EHLO command (which is after STARTTLS): [1]: No more commands pending [1]: Sending replies [1]: No more commands pending [1]: Client sent invalid command: Command line is too long [1]: command [unknown]: Invalid command [1]: command [unknown]: 500 reply: Submitted [1]: command [unknown]: Replied [1]: command [unknown]: Ready to reply [1]: Trigger output [1]: Sending replies [1]: command [unknown]: Next to reply [1]: command [unknown]: Completed [1]: command [unknown]: 500 reply: Sent: 500 5.5.2 Line too long [1]: command [unknown]: Finished [1]: command [unknown]: Destroy [1]: command [unknown]: 500 reply: Destroy [1]: Trigger output

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Aw: Re: convert mdbox to maildir
by lutz.niederer＠gmx.net 14 Aug '22

14 Aug '22

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mdbox: purge only if it's worthwhile
by Sven Strickroth 12 Aug '22

12 Aug '22

Hi, with the mdbox storage one needs to regularly run purge to really clean up deleted mails from the storage. Running purge can be an IO intensive task as the files are append-only and even if in a 10 MB mdbox file only a small mail is deleted all other mails need to be copied to a new file. Therefore, I wonder whether there is the option to apply a threshold before a mdbox file is cleaned up, e.g. only purge an old mail if this affects > 10% of the mdbox filesize or if at least X bytes will be freed in an mdbox file. Is this possible ATM? Otherwise this can be seen as a feature request. Best, Sven PS: From the docs it's unclear to me how the mdbox rotating algorithm works. Is only to the latest mdbox file appended or it is possible that a small mail might be appended to an older mdbox file?

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pre-define or alter list of IMAP keywords
by spi 11 Aug '22

11 Aug '22

I am using Dovecot 2.3.4.1 with sdbox and mostly Thunderbird on Linux and FairEmail on Android as IMAP clients. I use a defined set of IMAP keywords to allow different users to mark and filter their mails based on keywords. That works pretty well but I stumble across an issue from time to time: In TB I can pre-define a list of keywords which the user can choose one from. FairEmail shows all those keywords Dovecot presents - there is nothing like the list in TB. Issue 1: If there are no mails flagged in a folder, Dovecot doesn't present any keywords and therefore FairEmail shows none - the user has to remember and type in the correct keyword. Issue 2: After some time FairEmail shows a huge list of keywords for the INBOX, even keywords not in use for quite some time. To get rid of these keywords I deleted the index files on Dovecot (which with sdbox are not meant to be deleted?). It seems, Dovecot caches the keywords in the index files. Question: 1) Is there a way on Dovecot to define a list of keywords Dovecot presents to the IMAP clients? 2) If not, is there a nicer way to clean the keyword lists from old entries not assigned to any mail in that folder? -- Cheers spi

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Sieve rule for whitelisting domains after spam processing
by Nicolae Iuoras 10 Aug '22

10 Aug '22

Hello, My mail server has a global Sieve rule defined in sieve_before to file messages classified as spam by spamassassin into the Spam folder: require ["regex", "fileinto", "imap4flags"]; if allof (header :regex "X-Spam-Status" "^Yes") { fileinto "Spam"; } This works great, except I'd like the ability to whitelist certain senders or domains whose emails end up in Spam, usually due to a misconfigured SPF DNS TXT record or something like that. I use Roundcube as my Webmail client, so the easiest way to whitelist would be to create a rule for each domain directly in Roundcube using its built-in Sieve integration to move legitimate messages out of the Spam folder. I already have several rules set up to flag and sort non-spam messages, and they're working fine. I therefore tried adding a simple rule to move Spam into the Inbox: # rule:[Not Spam] if allof (header :contains "from" "user(a)good-domain.com") { fileinto "INBOX"; } However, the above rule does not work as I expected. When I receive an email from good-domain.com that's classified as Spam by spamassassin, the global rule sends it to the Spam folder and it is not re-filed into the Inbox. The second rule doesn't seem to do anything. I'm probably doing something simple wrong, but I can't figure out what (I'm a Sieve newb). Any suggestions please? Thanks, Nick

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Submission Service Copy To Sent
by Asai 10 Aug '22

10 Aug '22

Greetings, We've had a longstanding problem with emails not being copied to the Sent folder that seems to be a bug with various email clients (Thunderbird, TypeApp.) I know that Dovecot has the option to use the Submission service to copy emails to Sent without using SMTP to do this. Would this solve the problem we've seen over the years of emails not being copied to the Sent folder on various clients under certain (unknown) conditions? Thanks for your insight here. Asai

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Re: how to setup dovecot to accept client certificates signed with a private CA when the server certificate is signed by a public CA
by jean-christophe manciot 09 Aug '22

09 Aug '22

@Marc@f1-outsourcing.eu No, the private CA certificate was not present there as I thought that its presence in the bundle pointed to by <ssl_ca> was enough. Anyway, placing it in /etc/ssl/certs and restarting dovecot does not change anything for the client, as expected. On Tue, Aug 9, 2022 at 10:09 AM jean-christophe manciot <actionmystique(a)gmail.com> wrote: > > @Marc@f1-outsourcing.eu > No, the private CA certificate was not present there as I thought that > its presence in the bundle pointed to by <ssl_ca> was enough. > Anyway, placing it in /etc/ssl/certs and restarting dovecot does not > change anything for the client, as expected. > > On Mon, Aug 8, 2022 at 9:28 PM Marc <Marc(a)f1-outsourcing.eu> wrote: > > > > Have you added your root CA to where the rest of the ca certs are stored on your distribution? > > > > > > > > > > I forgot to say that this mail server has been working perfectly for > > > many years (but without client certificates). > > > > > > On Mon, Aug 8, 2022 at 6:42 PM jean-christophe manciot > > > <actionmystique(a)gmail.com> wrote: > > > > > > > > @build+dovecot@de-korte.org > > > > > > > > ssl_ca = </etc/ssl/CA_Certificate_CRL_bundle.pem > > > > <ssl_ca> contains actually the private CA certificate bundled with the > > > > private CA CRL. > > > > > > > > ssl_cert = </etc/ssl/fullchain.pem > > > > <ssl_cert> contains the public server certificate bundled with Let's > > > > encrypt CA X3 cross-signed certificate. > > > > > > > > Maybe the latter should rather contain the root and intermediate > > > certificates. > > > > > > > > On Mon, Aug 8, 2022 at 11:45 AM Arjen de Korte > > > > <build+dovecot(a)de-korte.org> wrote: > > > > > > > > > > Citeren jean-christophe manciot <actionmystique(a)gmail.com>: > > > > > > > > > > > Hi everyone, > > > > > > > > > > > > I'm trying to setup dovecot to accept only client certificates > > > created > > > > > > with a private CA: > > > > > > auth_ssl_require_client_cert = yes > > > > > > ssl_verify_client_cert = yes > > > > > > ssl_ca = </etc/ssl/CA_Certificate_CRL_bundle.pem > > > > > > > > > > This is wrong, you should enter your private CA here. If > > > > > 'ssl_verify_client_cert' is not set to 'yes', this field should > > > > > generally be empty / not configured. > > > > > > > > > > > At the same time, dovecot is setup with an SSL certificate created > > > by > > > > > > a public CA (let's encrypt): > > > > > > ssl = required > > > > > > ssl_cert = </etc/ssl/fullchain.pem > > > > > > ssl_key = </etc/ssl/key.pem > > > > > > > > > > > > When I try to connect to the server with a client (evolution), I > > > get a > > > > > > connection error: > > > > > > "Client did not present valid SSL certificate" except that it is > > > valid. > > > > > > > > > > > > As you probably already know, let's encrypt does not create client > > > > > > certificates. > > > > > > It seems that using a different CA for client certificates and for > > > the > > > > > > server certificate is unsupported. > > > > > > > > > > > > Am I missing something? > > > > -- > Jean-Christophe -- Jean-Christophe

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how to setup dovecot to accept client certificates signed with a private CA when the server certificate is signed by a public CA
by jean-christophe manciot 08 Aug '22

08 Aug '22

Hi everyone, I'm trying to setup dovecot to accept only client certificates created with a private CA: auth_ssl_require_client_cert = yes ssl_verify_client_cert = yes ssl_ca = </etc/ssl/CA_Certificate_CRL_bundle.pem At the same time, dovecot is setup with an SSL certificate created by a public CA (let's encrypt): ssl = required ssl_cert = </etc/ssl/fullchain.pem ssl_key = </etc/ssl/key.pem When I try to connect to the server with a client (evolution), I get a connection error: "Client did not present valid SSL certificate" except that it is valid. As you probably already know, let's encrypt does not create client certificates. It seems that using a different CA for client certificates and for the server certificate is unsupported. Am I missing something? -- Jean-Christophe

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rawlog data in a lua script
by michael.zork＠feierfighter.de 08 Aug '22

08 Aug '22

Hi, I'm searching for a possibility to have the rawlog feature in lua, which would be much easier for processing. Currently Dovecot, when activating rawlog for a user, writes everything to disk (which creates I/O), and I have to somehow read it from there. That's a bit complicated, because I have to get notified via inotify or similar when there are new files created, and then I have to start a "tail" or "epoll" mechanism on the files to get the contents in more or less real time (IMAP sessions can be multiple hours or days). It would be much easier to hook to the "raw request and response events" inside Dovecot and have the rawlog-data in a lua script, where I can prepare it and send it to another maschine for monitoring/collection/analysis/statistics or similar, for example via HTTP. Having the rawlog data available in lua would make things a lot easier. Is there any possibility at the moment to create a lua script and "hook" to those "request and response events"? If not, would it be possible to add that feature in the future? Kind regards Michael

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