July 2020 - dovecot - dovecot.org

Static users and doveadm
by Antonio Leding 14 Jul '20

14 Jul '20

Hello Dovecot users… I wanted to ask is using a static userdb will cause issues with some of the account and user related doveadm commands? If so, any suggestions on how to use doveadm in such a configuration? I have pasted both the cmd + error and userdb config below — Thanks in advance… sudo doveadm mailbox list -A Error: auth-master: userdb list: User listing returned failure doveadm: Error: Failed to iterate through some users userdb { args = uid=vmail gid=vmail home=/var/vmail allow_all_users=yes userdb_warning_disable=yes driver = static }

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Apple Mail and subfolders
by Filip Hajný 14 Jul '20

14 Jul '20

Hi all, does anybody here use MacOS (Catalina) Mail, who can confirm that subfolders (i.e. folders inside folders) work for them? It seems that I cannot create/access Maildir subfolders at all. Subfolders created in Mail show up as '.folder\2esubfolder' on disk, suggesting that Apple Mail is URL-coding the dot separator before it passes it onto Dovecot. No such translation takes place when interpreting the IMAP tree though, resulting in subfolders rendered as plain entries with the dot separator preserved. Subfolders can be created from elsewhere (SoGO, Roundube, Thunderbird) just fine and work here just fine, suggesting that all is well in terms of Dovecot configuration. Subfolders created here though show up as a proper hierarchy in Apple Mail, but their contents is not displayed, so the user thinks the subfolder is empty. This definitely used to work fine in the past. Running 2.3.10.1 as part of the Mailcow suite. -F

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Syncing emails from external server like Gmail
by Vitalii 14 Jul '20

14 Jul '20

Greeting I've managed to backup my emails from external email server via dsync and imapc: protocol like this: doveadm -Dv -o imapc_user='user(a)gmail.com' -o imapc_password="pass" -o imapc_host=imap.gmail.com backup -R -u duke(a)ejoom.com imapc: taken from https://wiki.dovecot.org/Migration/Dsync I wish to do regular syncing of 5min interval to substitute 'getmail' program. When I repeat the command It doesn't download all the attachments(!good) but It seems that at retrieve all the the GUIDs and UIDs(!bad) again that take quite long considering 30K emails. The question is how to speed it up and retrieve only new emails? Does anyone have a solution for regular synchronization? What is the best way? Logs look like this: https://gist.githubusercontent.com/vnagara/87e0da1b21b51f68fd74270b3ec653b3… It wrights that "Mailboxes are equal" but still verifies all the UIDs again. Thanks.

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Fwd: Dsync mail migration from v2.2 --> v2.3
by Antonio Leding 14 Jul '20

14 Jul '20

Two items I forgot to mention in my initial post: (A) I am running the sync command on the new v2.3 server. (B) To get sync to work, I had to add the following to the old v2.2 server: auth_socket_path = /var/run/dovecot/auth-master I think this relates to what I said in my initial post about AWS linux installing all of the sockets into a non-standard location. I say this because when I was trying get this working but before I had added the above setting, I noticed the following message: Error: userdb lookup: connect(/usr/local/var/run/dovecot/auth-userdb) failed: No such file or directory This seemed to indicate that the old server was looking for the auth socket in the incorrect location. So, I decided to correct this with the setting I noted above. Please let me know if I had this correct or perhaps there is something else going on here… Thanks... > Begin forwarded message: > > From: Antonio Leding <tech(a)leding.net> > Subject: Dsync mail migration from v2.2 --> v2.3 > Date: July 13, 2020 at 8:45:18 PM PDT > To: dovecot(a)dovecot.org > > Hello all, > > I’ve been battling how to migrate my imap mail following a new server install that has Dovecot and Postfix upgrades. > > The research seems pretty clear that the preferred method is to use dsync to get the mail from Server-A to B. After several hours and several different combos, I think I might finally have this working. However, before committing to my procedure and running it against all mailboxes, I wanted to bounce this off of the community and get any feedback that might catch possible issues and\or offer some advice. > > Environment > > Old server: Dovecot 2.2.2 running on AWS linux 1 (I believe that is based on RHEL 4 or 5). > New server: Dovecot 2.3.10.1 running on CentOS 7.6. > All authentication is done by Dovecot against a mySQL (and Maria) database — nothing is in files. > All mail data and mailboxes are owned by a dedicated user “vmail” and I’m using a static userdb. > SSH is via public key file only — no PW based SSH is allowed. > SSH is on a non-standard port > > Operations > > I’ve decided to migrate one mailbox per command. I only have about 30 accounts on the server so this shoudn't be a huge deal. > Here is the command that I believe is good to go: > > sudo doveadm -Dv sync -u [ MBOX_TO_MIGRATE ] remote:vmail@[ SERVER ] > > The SERVER references a host stanza in root's SSH connection file: /root/.ssh/config > I need to use the config file because I (a) use a non-standard SSH port; (b) need to login as “vmail” ; (c) need to use the “vmail" identity file. > > Comments & notes > > The Dovecot 2.2 package for AWS Linux was apparently setup to install all of the sockets in /usr/local/var/run/dovecot. This must have caused authentication issues because to get it working properly, I then had to add "path = /var/run/dovecot/auth-master” statement to the “auth" stanza in dovecot.conf file. > Also, the fact that I do not use a “standard” SSH config was an issue early on but once I committed to allowing vmail to SSH into the old server, that part became moot. For security purposes, I will probably disable vmail SSH after the data is migrated. > > Questions > > First and foremost — any obvious issues here? > Next, any advice and\or lessons learned with this type of migration? > Finally, presuming this is the proper way to do this, will this migrate all mail content including Sent, Deleted, Drafts, etc.? > > > Thanks in advance for taking the time and providing any feedback — very much appreciated... > >

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Dsync mail migration from v2.2 --> v2.3
by Antonio Leding 14 Jul '20

14 Jul '20

Hello all, I’ve been battling how to migrate my imap mail following a new server install that has Dovecot and Postfix upgrades. The research seems pretty clear that the preferred method is to use dsync to get the mail from Server-A to B. After several hours and several different combos, I think I might finally have this working. However, before committing to my procedure and running it against all mailboxes, I wanted to bounce this off of the community and get any feedback that might catch possible issues and\or offer some advice. Environment Old server: Dovecot 2.2.2 running on AWS linux 1 (I believe that is based on RHEL 4 or 5). New server: Dovecot 2.3.10.1 running on CentOS 7.6. All authentication is done by Dovecot against a mySQL (and Maria) database — nothing is in files. All mail data and mailboxes are owned by a dedicated user “vmail” and I’m using a static userdb. SSH is via public key file only — no PW based SSH is allowed. SSH is on a non-standard port Operations I’ve decided to migrate one mailbox per command. I only have about 30 accounts on the server so this shoudn't be a huge deal. Here is the command that I believe is good to go: sudo doveadm -Dv sync -u [ MBOX_TO_MIGRATE ] remote:vmail@[ SERVER ] The SERVER references a host stanza in root's SSH connection file: /root/.ssh/config I need to use the config file because I (a) use a non-standard SSH port; (b) need to login as “vmail” ; (c) need to use the “vmail" identity file. Comments & notes The Dovecot 2.2 package for AWS Linux was apparently setup to install all of the sockets in /usr/local/var/run/dovecot. This must have caused authentication issues because to get it working properly, I then had to add "path = /var/run/dovecot/auth-master” statement to the “auth" stanza in dovecot.conf file. Also, the fact that I do not use a “standard” SSH config was an issue early on but once I committed to allowing vmail to SSH into the old server, that part became moot. For security purposes, I will probably disable vmail SSH after the data is migrated. Questions First and foremost — any obvious issues here? Next, any advice and\or lessons learned with this type of migration? Finally, presuming this is the proper way to do this, will this migrate all mail content including Sent, Deleted, Drafts, etc.? Thanks in advance for taking the time and providing any feedback — very much appreciated...

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Re: Dovecot permission denied errors on NFS after upgrade to 2.2.17
by Claudio Corvino 13 Jul '20

13 Jul '20

Hi Jochen, the ID has not changed, in addition the "permission denied" error is random, most of the time Dovecot works well. How can I check the mappings NFS uses? After the Debian upgrade I was using these NFS mount options: rw,user,rsize=8192,wsize=8192,timeo=30,intr Now trying to fix the problem I set "defaults" mount option, but nothing has changed. Thanks On 13/07/20 13:08, Jochen Bern wrote: > On 07/13/2020 12:57 PM, Claudio Corvino wrote: >> we just upgraded our mail server from Debian 8 to Debian 9, so our >> dovecot packages just got upgraded from version 2.2.13 to 2.2.17. > [...] >> Every directory and sub-dir under >> /mnt/mail-storage >> is assigned to vmail:vmail with >> drwx------ >> permission set. > Just a quick shot into the dark, you verified the ownerships on the NFS > *client*, not the NFS *server*, yes? Because NFS speaks UIDs and GIDs, > not their names, so if your Debian 9 installation assigned different IDs > to "vmail" ... > > (You might also want to check what mappings the NFS mount uses, > including possible *default* behaviour.) > > Good luck,

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Dovecot permission denied errors on NFS after upgrade to 2.2.17
by Claudio Corvino 13 Jul '20

13 Jul '20

Hi everyone, we just upgraded our mail server from Debian 8 to Debian 9, so our dovecot packages just got upgraded from version 2.2.13 to 2.2.17. Now we have a lot of errors in our dovecot.log about permission denied (our Mailboxes are on NFS remote server since years without problems) like these: Jul 13 12:39:23 Error: imap(XXXXXXXXX): open(/mnt/mail-storage/XXXXXXXXX/Maildir/cur/1594378191.M653755P26498.ganimede,S=12716,W=12984:2,S) failed: Permission denied (euid=501(vmail) egid=501(vmail) missing +r perm: /mnt/mail-storage/XXXXXXXXX/Maildir/cur/1594378191.M653755P26498.ganimede,S=12716,W=12984:2,S stat(/mnt/mail-storage/XXXXXXXXX/Maildir/cur/1594378191.M653755P26498.ganimede,S=12716,W=12984:2,S) failed: Permission denied) For some user this is not a problem, for some other user this blocks their mail client (Thunderbird). We use vmail user for running Dovecot and I can't find a permission problem on the path indicated by the mail error, user vmail can read and write and uid and gid seems to be correct. Permissions on /mnt/mail-storage was drwx------ 94 vmail vmail 4096 ago 29 2019 mail-storage I just changed to drwxr-xr-x 94 root root 4096 ago 29 2019 mail-storage but nothing has changed. Every directory and sub-dir under /mnt/mail-storage is assigned to vmail:vmail with drwx------ permission set. If try to stat on /mnt/mail-storage/XXXXXXXXX/Maildir/cur/1594378191.M653755P26498.ganimede,S=12716,W=12984:2,S I get permission denied. We use LMTP and Postfix to deliver mail to mailbox. mail_debug=yes already enabled; mail_fsync is set to never (should I change to always?). Please could you give us help on the matter as I don't know where to look further. Thanks Claudio

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Re: Please Help me
by Kishore Potnuru 13 Jul '20

13 Jul '20

Hi Vitalii, I am using "Maildir". Thanks Kishore Potnuru On Mon, Jul 13, 2020 at 10:32 AM Vitalii <vnagara(a)yandex.com> wrote: > On Sun, 12 Jul 2020 21:17:48 +0100 > Kishore Potnuru <kishore.reachme(a)gmail.com> wrote: > > > Hi All, > > > > I need to migrate the complete data & setup/environment from an old > > dovecot environment to a new dovecot environment. > > Hi Kishore, > I was wondering what mail format do you use Maildir/mdbox/sdbox? >

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Please Help me
by Kishore Potnuru 13 Jul '20

13 Jul '20

Hi All, I need to migrate the complete data & setup/environment from an old dovecot environment to a new dovecot environment. Old environment details: ======================== Linux OS - Red Hat Enterprise Linux Server release 6.5 (Santiago) Dovecot version - 2.0.9 Postfix version - 2.6.6 New Environment details: ( 2 systems) ======================== Linux OS - Red Hat Enterprise Linux Server release 7.7 (Maipo) Dovecot version - 2.2.36 (1f10bfa63) Postfix version - 2.10.1 In the new environment, I have 2 servers. I have got 2 of the above servers with above configuration and need to create HA/Resilience. I know there is advanced versions in Redhat and Dovecot. As per my organisation's existing support/policy, that is what maximum supported RHEL and official version of dovecot as per RHEL 7.7. Now my questions are: 1. I will stop the dovecot/postfix services on the server in old environment. Is it possible to move/copy the complete configuration along with data (directories/sub-directories/users/groups/existing email in new or cur folders/complete email domains along with complete structure) to the other 2 servers in new env? Could you please suggest me the commands or steps follow that? 2. Now, With the above 2 servers, I would like to create the HA/Resilience. I know there is a Replication options which are there. Could you please provide me the steps/video, how it needs to be done? I have got the systems and I need to move/copy the environment to a new environment and create the HA/Resilience. I am not sure, how to proceed and what needs to be done clearly? I am stuck here. Please help me in this step by step procedure. Thanks, Kishore Potnuru

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INBOX folders disappeared after upgrading
by Dave 12 Jul '20

12 Jul '20

Hi, tried to Google/etc to see what to tweak.. not finding anything helpful. So.. I've been running my private mail through a Linux server since approx year 2000. The OS has been various flavors of Fedora or CentOS, since for work, I have to spend all day supporting some sort of Red Hat flavor. So I run SquirrelMail on top of Dovecot and Postfix on CentOS 7, things have been great for like forever. I recently ran updates and all my INBOX folders disappeared. I have made no configuration changes in at least 5 years. I can't seem to resolve/figure out what's going on. I have backups to see everything before the update. I've noticed that my subscriptions file is missing all the folders, which are all in this file in the backups. If I repopulate this file with the names, the next time I access mail, they are all removed. Most of my mail is in folders, therefore I have access to almost none of it (can see new stuff coming in, but can't sort it anywhere). k, for the details.. I was running dovecot-2.2.10 (2.2.10-8.el7.x86_64) and was updated to dovecot-2.2.36 (2.2.36-3.el7_7.1.x86_64) with yum updates. # dovecot --version 2.2.36 (1f10bfa63) # dovecot -n # 2.2.36 (1f10bfa63): /etc/dovecot/dovecot.conf # OS: Linux 3.10.0-1062.18.1.el7.x86_64 x86_64 CentOS Linux release 7.7.1908 (Core) # Hostname: vm1.tech...com auth_mechanisms = plain login login_greeting = IMAP ready. mail_location = maildir:~/Maildir mbox_write_locks = fcntl namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Trash { special_use = \Trash } prefix = } passdb { driver = pam } service auth { unix_listener /var/spool/postfix/private/auth { mode = 0600 user = postfix } } service imap-login { inet_listener imap { address = 127.0.0.1,68.139.25.150 } inet_listener imaps { address = 127.0.0.1,68.139.25.150 } } service pop3-login { inet_listener pop3 { port = 0 } inet_listener pop3s { address = 127.0.0.1,68.139.25.150 } } ssl = required ssl_cert = </etc/pki/tls/certs/mail.tech...com.crt ssl_cipher_list = ALL:!aNULL:!eNULL:!LOW:!EXP:!RC4 ssl_key = # hidden, use -P to show it ssl_prefer_server_ciphers = yes userdb { driver = passwd } Regards, -Dave

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