ISPConfig 3 mail import from ISPConfig 2

[crisstm]

i've change my server control panel from ISPConfig 2 to ISPConfig 3.
I have save all web mails from old server and now i want to import mail's in new server , but didn't work.
i tried to copy all mails from Maildir, and i have change the permission of hole folder /vmail with "chmod -R vmail:vmail /var/vmail".
How is the method to import all my clients emails from old server?
Thank's

[crisstm]

nobody answer to this forum?

[till]

You can copy the emails from the old to the new server as ispconfig 2 aqnd 3 both use maildir format. I've done this on several client servers and it worked well for me, if it dont work for you, then you most likely copied the email files into the wrong directory.

[crisstm]

Thank's for answer Till,

i have copied all mail's files in the same folder.
For example in ISPConfig 2 the folder for mail was:
/var/www/www.domain.tld/user/mailname/ and here i get 3 folders
cur new tmp
In ISPConfig 3 folder for mail is:
/var/vmail/domain.tld/mailname
and here i have the same 3 folders cur new tmp.
I copied from new to new, and then when i check with thunderbird client i get some errors

[hsluis]

Hello crisstm, in this month I will be migrating ispconfig 2 to ispconfig 3. I'm reading the forum post to see what I have to do.

How do you resolve the mail problems? And what recomendation do you have to make the migration?

Thanks!