Merge dbbda75e30 into 33c845294a

pages/01.administrate/07.specific_use_cases/06.email_migration/email_migration.md

@@ -44,3 +44,62 @@ Transfer emails from one server to another:
 larch -a -f imaps://serveur_d'origine.org -t imaps://serveur_de_destination.org
 ```
 For other types of transfer refer to [Larch documentation](https://github.com/rgrove/larch#label-Usage).
+
+### mbsync/isync
+
+[isync site](https://isync.sourceforge.io/)
+
+The names isync (the project) and mbsync (the program) are about the same 'thing'
+
+The program is available in the Debian repositories. Install by: 
+```bash
+sudo apt install isync
+```
+
+To run mbsync, a configuration file in your home directory is needed. Then run:
+```bash
+mbsync -a
+```
+
+A configuration file for syncing two IMAP mailboxes looks like:
+```
+# old account
+## account access definition
+IMAPAccount friendly_name      # free format
+Host imap.domain.tld           # the old/existing mailserver
+User email_address@domain.tld  # your credentials for that server
+Pass secret_password           # 
+SSLType IMAPS                  # probably IMAPS
+CertificateFile /etc/ssl/certs/ca-certificates.crt
+
+## mbsync account/data reference
+IMAPStore friendly_name  # free format, easy when identical
+Account friendly_name    # has to match IMAPAccount above
+
+
+# new account
+## account access definition
+IMAPAccount yuno      # again, give it a recognizable name
+Host mydomain.tld     # the new Yunohost mailserver 
+User my_yuno_user     # your Yunohost SSO username 
+Pass password         # and pass 
+SSLType IMAPS         # IMAPS for Yunohost
+CertificateFile /etc/ssl/certs/ca-certificates.crt 
+
+## mbsync account/data reference 
+IMAPStore yuno    # again, free to choose, both yuno is easy
+Account yuno      # again, has to match the name above
+
+# synchronization definition 
+Channel oldmail2yuno   # give this combination of settings a name 
+Master :friendly_name: # the IMAPStore-name where the old mail is 
+Slave :yuno:           # the IMAPStore-name of your new Yunohost 
+Patterns *             # probably you want everything ...
+CopyArrivalDate yes    # ... with the original date 
+Create Slave           # if folder/mail does not exist, create it on Yunohost 
+Expunge None           # don't throw things away 
+Sync All               # without sync it would not be so useful
+# this directory needs to exist; mkdir manually in advance
+Syncstate /home/my_yuno_user/.mbsync_state/   # mkdir `name` has to match this setting, of course 
+
+```