Help with migration to Dovecot from raw files

[Aki Tuomi]

You could try something simple like just

for n in *; do cat $n | doveadm save -u targetuser; done

or if the IceWarp has IMAP interface, you could try

doveadm -o imapc_host=hostname -o imapc_user=username -o imapc_password=password sync -1R targetuser imapc:

Aki

> On 26/03/2020 12:11 Stefano Antonelli <dovecot at intheworks.ca> wrote:
> 
>  
> Hello list,
> 
> I recently migrated to Dovecot from a very old version of IceWarp 
> running on failing hardware running Windows XP.  I had a lot of issues 
> downloading mail through imap.  What I have instead are the email files 
> directly off the harddrive from IceWarp's mail store.
> 
> I rearranged the mail files to look like a Dovecot maildir and tried to 
> use these emails directly.  Dovecot did not complain, but I ran into my 
> first problem.  The emails were out of order on the client side.  None 
> of my imap clients store email.  They all just fetch headers and 
> download mail as it's required.  So a resync is not a problem.  I just 
> can't figure out how and I don't know if the filenames are a problem.
> 
> The files I'm working with have this format:
> 
> 2020032512105639B0-000001000000D2D45079615C.imap
> 
> The first part is the date and all the the filenames appear to be 
> unique.  Is it okay to leave them this way or should I rename them in 
> the same fashion as Dovecot?  If so, is there a tool I can use or do I 
> need to write a script?  If I have to write a script, could someone help 
> me decipher this filename:
> 
> 1585197800.M440284P10160.hostname,S=2812,W=2875:2,S
> 
> I understand the first bit is a unix timestamp.  I couldn't find out 
> what M440284P10160 means or how I might create that number myself to use 
> in a renaming script.  Additionally, I'd like to customise the hostname 
> without changing the machine's hostname and I understand that the S and 
> W can also be omitted.  I'm not using quotas.  I couldn't find anywhere 
> in the documentation where it talked about any configuration options for 
> the filenames.  Are there any or do I have to patch the source?
> 
> I was also planning on directly backing up the email using rsync, but 
> the changing filenames with flags is obviously an issue.  I understand 
> that dovecot can store flags in a file instead, if the mailbox is shared 
> or public.  Is there any way to have this behaviour with a private 
> mailbox?  Ideally the filenames are not touched after creation in which 
> case rsync will work nicely to my NAS.
> 
> The last issue is that since Dovecot went live, I've started receiving 
> mail.  For the time being, I have left my "yet to be migrated" mail 
> outside of maildir.  So Dovecot doesn't know about it.  I will need to 
> merge this newly received mail with my "yet to migrated mail" once I 
> sort out exactly how to migrate that mail.  And I would really like all 
> the mail to sort properly.
> 
>  From what I can tell doveadm is the tool for the job, but I just can't 
> make sense of the documentation.
> 
> Thanks,
> Stef
> 
> Dovecot version:  2.3.4.1 (f79e8e7e4)