- dovecot - dovecot.org

Redirects 550'd So why no SRS method
by Laura Steynes 05 Jan '24

05 Jan '24

Happy New Year! Now to Aki, Timo, Corr, why, when setting up mail forwarding, is sieve not automatically configuring rules for SRS, it has this ability for long time, yet dovecots sieve based forwarding just creates a plain old redirect "forward" resulting in,in 2024, 99% of forwarded emails getting rejected for failing SPF because it's not enabling the require or the rules needed for successful sender rewriting. Is this an oversight? and I suppose the bigger question is, when is it planned to be corrected to using SRS method? Happy New Year! Now to Aki, Timo, Corr, why, when setting up mail forwarding, is sieve not automatically configuring rules for SRS, it has this ability for long time, yet dovecots sieve based forwarding just creates a plain old redirect "forward" resulting in,in 2024, 99% of forwarded emails getting rejected for failing SPF because it's not enabling the require or the rules needed for successful sender rewriting. Is this an oversight? and I suppose the bigger question is, when is it planned to be corrected to using SRS method?

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Piegonhole behaviour when redirect fails
by Aubry Jaquier 04 Jan '24

04 Jan '24

Hello, I noticed an unusual behavior of the implicit keep from pigeonhole when a redirect fails in a sieve script. For instance, with the sieve below, if the relay host is unavailable, dovecot will not accept the email and will respond with a tempfail. redirect "myaddress(a)domain.com"; stop; But if my sieve script has a fileinto inside (see the example below), dovecot will accept the message, copy the email in the INBOX and in the folder from the fileinto and write the following log "Execution of script filter.sieve failed, but implicit keep was successful" fileinto "Folder"; redirect "myaddress(a)domain.com"; stop; According to the RFC 5228, section 2.10.2 Implicit keep, the last example should not trigger an implicit keep but act like the first example. An implicit keep is performed if a message is not written to a mailbox, redirected to a new address, or explicitly thrown out. That is, if a fileinto, a keep, a redirect, or a discard is performed, an implicit keep is not. Does it look like a bug to you, or is this the intended behaviour ? Best regards, Aubry Hello, I noticed an unusual behavior of the implicit keep from pigeonhole when a redirect fails in a sieve script. For instance, with the sieve below, if the relay host is unavailable, dovecot will not accept the email and will respond with a tempfail. redirect "myaddress(a)domain.com"; stop; But if my sieve script has a fileinto inside (see the example below), dovecot will accept the message, copy the email in the INBOX and in the folder from the fileinto and write the following log "Execution of script filter.sieve failed, but implicit keep was successful" fileinto "Folder"; redirect "myaddress(a)domain.com"; stop; According to the RFC 5228, section 2.10.2 Implicit keep, the last example should not trigger an implicit keep but act like the first example. An implicit keep is performed if a message is not written to a mailbox, redirected to a new address, or explicitly thrown out. That is, if a fileinto, a keep, a redirect, or a discard is performed, an implicit keep is not. Does it look like a bug to you, or is this the intended behaviour ? Best regards, Aubry

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Autocreate virtual users' home directory?
by John Fawcett 04 Jan '24

04 Jan '24

Hi I have recently rectified an old configuration error whereby I had virtual users' home and mail directories set to the same value. I used option 3 from "ways to set up home directory" https://doc.dovecot.org/configuration_manual/home_directories_for_virtual_u… so I have: home= |/var/vmail/domain/user/home/| mail= |/var/vmail/domain/user/| |where domain and user are substituted for the real domain and user.| For existing users where I created the home directory when migrating the settings, there is no issue. But I am seeing errors like this for new users: lmtp(test(a)example.com)<125035><EHDOAyS1lWVr6AEAjpgUYA>: Error: autoexpunge: Couldn't create dovecot.autoexpunge.lock lock: file_create_locked(/var/vmail/example.com/test@example.com/home//dovecot.au… failed: safe_mkstemp(/var/vmail/example.com/test@example.com/home//dovecot.autoexpu… failed: No such file or directory Seems that differently to mail directory which is automatically created, the home directory is not created. I couldn't see any config setting that would autocreate home directories (where home directories are subdirectories of mail directories). Would it be worthwhile introducing an autocreate option for home directories? John Hi I have recently rectified an old configuration error whereby I had virtual users' home and mail directories set to the same value. I used option 3 from "ways to set up home directory" https://doc.dovecot.org/configuration_manual/ home_directories_for_virtual_users/ so I have: home= /var/vmail/domain/user/home/ mail= /var/vmail/domain/user/ where domain and user are substituted for the real domain and user. For existing users where I created the home directory when migrating the settings, there is no issue. But I am seeing errors like this for new users: lmtp(test(a)example.com)<125035><EHDOAyS1lWVr6AEAjpgUYA>: Error: autoexpunge: Couldn't create dovecot.autoexpunge.lock lock: file_create_locked(/var/vmail/ example.com/test@example.com/home//dovecot.autoexpunge.lock) failed: safe_mkstemp(/var/vmail/example.com/test@example.com/home// dovecot.autoexpunge.lock) failed: No such file or directory Seems that differently to mail directory which is automatically created, the home directory is not created. I couldn't see any config setting that would autocreate home directories (where home directories are subdirectories of mail directories). Would it be worthwhile introducing an autocreate option for home directories? John

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Solr/Tika patches for dovecot 2.3.21
by John Fawcett 03 Jan '24

03 Jan '24

Hi I've just made updated versions of 3 patches against the latest release 2.3.21 in case they are useful to someone or might get considered for official inclusion. John *dovecot-2.3.21-tika-http-auth.patch* Allows specification of username and password in the fts_tika setting for basic auth against tika server. For example fts_tika = https://user:password@tika_server:443/tika *dovecot-2.3.21-solr-max-size.patch * This is a simplified version of my previous patch. Sets a size limit (configuration fts_max_size) on message bodies that are to be indexed. Message bodies for messages larger than fts_max_size are not sent to solr. Defaults to zero which means no limit. For example fts_max_size = 10M *dovecot-2.3.21-solr-max-rows.patch * When dovecot sends a search to solr it uses the rows parameter. For multiple mailbox search the value used is SOLR_MAX_MULTI_ROWS , hardcoded to 100000. For single mailbox search the value is uidnext. This patch introduces an upper limit for single mailbox search using the same value as SOLR_MAX_MULTI_ROWS, while leaving the existing functionality of sending the uidnext value if it is smaller. This is just to place a more reasonable upper bound since uidnext can get much larger. Hi I've just made updated versions of 3 patches against the latest release 2.3.21 in case they are useful to someone or might get considered for official inclusion. John dovecot-2.3.21-tika-http-auth.patch Allows specification of username and password in the fts_tika setting for basic auth against tika server. For example fts_tika = https://user:password@tika_server:443/tika dovecot-2.3.21-solr-max-size.patch This is a simplified version of my previous patch. Sets a size limit (configuration fts_max_size) on message bodies that are to be indexed. Message bodies for messages larger than fts_max_size are not sent to solr. Defaults to zero which means no limit. For example fts_max_size = 10M dovecot-2.3.21-solr-max-rows.patch When dovecot sends a search to solr it uses the rows parameter. For multiple mailbox search the value used is SOLR_MAX_MULTI_ROWS , hardcoded to 100000. For single mailbox search the value is uidnext. This patch introduces an upper limit for single mailbox search using the same value as SOLR_MAX_MULTI_ROWS, while leaving the existing functionality of sending the uidnext value if it is smaller. This is just to place a more reasonable upper bound since uidnext can get much larger.

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how to take mdbox extract of time interval and restore that again?
by lutz.niederer＠gmx.net 03 Jan '24

03 Jan '24

Hi! Due to a fatal hardware error we have to extract data of all existing imap accounts and all their boxes/folders etc. from an mdbox store starting with the 5th of december until today. Then we have to restore the old system and import the data back into it. Mail before 5th will come from the system backup, newer mail from that export. After that it may be possible that some/few mails may exist twice in the boxes, but that's ok. 1. What would be the command line for doveadm to extract everything starting the 5th? I find that the command line for doveadm is pretty complicated. I tried but I am not sure if I really got all mails exported. So I would like to ask if someone with much more experience can give me a command line that surely does what we want. The command will be run from a remote machine. 2. And what would be the command line to restore all the mails that we have exported back into the system? (The folder and account structure is the same.) 3. After that some of the mails may exist twice. Is that a problem, maybe because of internal IDs? 4. Are there any other things we need to be aware of when doing that? I thank you very much for your help! Cheers! -lutzn

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Broken Docs
by Peter 02 Jan '24

02 Jan '24

The page: https://doc.dovecot.org/configuration_manual/protocols/lmtp_server/ ... has links to the old dovecot wiki which are now broken, specifically the Postfix and Exim links at the bottom of the page. Can someone please port those pages over to the docs and fix the links? Peter

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Certificate of the documentation site (https://doc.dovecot.org/)
by gileh13242＠vasteron.com 02 Jan '24

02 Jan '24

Hey ! Your certificate expired today, I can't access it because of my business proxy :). [No Error] (TLS code: X509_V_ERR_CERT_HAS_EXPIRED) SSL Certificate expired on: Jan 2 06:31:02 2024 GMT Have a nice day !

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A bug and a misleading description
by David Van Edwards 01 Jan '24

01 Jan '24

!. I have just tried deleting Sent messages and when I put the search string 1:200 in only one message was deleted. And when I put in 1:500 again only one message was deleted. In both cases a green message box came up saying the operation was successful. 2. I successfully deleted 1000 messages from my Inbox using the search string 1:1000 but it was not clear to me that this would delete the 1000 most RECENT emails, not as I imagined the FIRST 1000 emails counting from the beginning. Is that the case? It certainly seems to have been the result and it’s rather upsetting. Should your documentation make it clear whether 1:1000 is counting forwards or backwards? Best wishes, David David Van Edwards The Smokehouse 6 Whitwell Road, Norwich NR1 4HB 01603 629899 david(a)vanedwards.co.uk https://www.vanedwards.co.uk

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Authentication failure due to address space limit
by Max Nikulin 26 Dec '23

26 Dec '23

Hi, I faced an error that appeared rather obscure at first, so I am trying to figure out if something can be improved. I have managed to solve the issue. I am running a Dovecot IMAP server to keep my personal mail archive. This server does not receive or send mail, just IMAP access. There was no reason to tune its performance, so its configuration is close to what Debian package has out of the box (actually doc/example-config). At certain moment I started to get authentication failures: dovecot[72165]: auth-worker: Error: fatal error: failed to reserve page summary memory dovecot[72165]: auth-worker: Error: dovecot[72165]: auth-worker: Error: runtime stack: dovecot[72165]: auth-worker: Error: runtime.throw({0x7f552c418194?, 0x7f552c1feb10?}) dovecot[72165]: auth-worker: Error: runtime/panic.go:1047 +0x5f fp=0x7f552c1feac0 sp=0x7f552c1fea90 pc=0x7f552c28a53f dovecot[72165]: auth-worker: Error: runtime.(*pageAlloc).sysInit(0x7f552c5f6fd0) dovecot[72165]: auth-worker: Error: runtime/mpagealloc_64bit.go:82 +0x195 fp=0x7f552c1feb48 sp=0x7f552c1feac0 pc=0x7f552c280ef5 dovecot[72165]: auth-worker: Error: runtime.(*pageAlloc).init(0x7f552c5f6fd0, 0x7f552c5f6fc0, 0x0?) dovecot[72165]: auth-worker: Error: runtime/mpagealloc.go:324 +0x70 fp=0x7f552c1feb70 sp=0x7f552c1feb48 pc=0x7f552c27eb50 dovecot[72165]: auth-worker: Error: runtime.(*mheap).init(0x7f552c5f6fc0) dovecot[72165]: auth-worker: Error: runtime/mheap.go:729 +0x13f fp=0x7f552c1feba8 sp=0x7f552c1feb70 pc=0x7f552c27bf5f dovecot[72165]: auth-worker: Error: runtime.mallocinit() dovecot[72165]: auth-worker: Error: runtime/malloc.go:407 +0xb2 fp=0x7f552c1febd0 sp=0x7f552c1feba8 pc=0x7f552c260e72 dovecot[72165]: auth-worker: Error: runtime.schedinit() dovecot[72165]: auth-worker: Error: runtime/proc.go:693 +0xab fp=0x7f552c1fec30 sp=0x7f552c1febd0 pc=0x7f552c28df0b dovecot[72165]: auth-worker: Error: runtime.rt0_go() dovecot[72165]: auth-worker: Error: runtime/asm_amd64.s:345 +0x120 fp=0x7f552c1fec38 sp=0x7f552c1fec30 pc=0x7f552c2b7c20 dovecot[72165]: auth: Error: auth-worker: Aborted PASSV request for mailuser: Worker process died unexpectedly dovecot[72165]: auth-worker: Fatal: master: service(auth-worker): child 72211 returned error 2 Such errors happen even for invalid users curl -v 'imap://bad:bad@localhost/' I have realized that it may be related to the pam_fscrypt plugin I had installed before. It is intended for another system user, so I did not expect any negative consequence on Dovecot. Disabling the module confirmed my guess. This PAM module is written in Go and language runtime requires almost 1G of address space (RLIMIT_AS) even when actual memory allocation is several times lower (the user has no configured login protector). https://github.com/golang/go/issues/38010 "runtime: high startup address space usage (RLIMIT_AS) on Linux AMD64" The code of the fscrypt PAM module has Go panic handlers, but this case error happens early during runtime initialization, so error handlers have not set yet and can not provide a more instructive error. I do not like that Go has no knobs like compile or link flags to prevent early allocation of rather large address space. At the same time I admit that doing garbage collection efficiently is tricky and unreasonable efforts may be required to allow modest address space at startup. Default Dovecot configuration has vsz_limit = $default_vsz_limit = 256M The following configuration snippet solves the issue: service auth-worker { # still crash, but later # vsz_limit = 800M vsz_limit = 1024M } I am realizing that my use case is rather specific. Mail and encrypted home directories are hardly compatible. However some other PAM modules may cause similar issues. Cgroup Linux kernel feature should allow to limit real memory usage and it should be better than per-process limits imposed on address space size. However assigning proper control groups for Dovecot processes may be not so trivial. I am unsure if auth-worker vsz_limit or default_vsz_limit should be raised in the example configuration. Do you think it is reasonable to add warnings concerning PAM plugins and vsz_limit to docs? I mean - https://doc.dovecot.org/configuration_manual/authentication/pam/ - https://doc.dovecot.org/configuration_manual/service_configuration/#auth-wo… in a similar way as it is done for Argon2 in https://doc.dovecot.org/configuration_manual/authentication/password_scheme… P.S. Debian 12 bookworm, Dovecot 1:2.3.19.1+dfsg1-2.1

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by petersthomas383＠gmail.com 19 Dec '23

19 Dec '23

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