Sent folder shows sender instead of recipient
I'm trying to migrate mailboxes from 7.1.0_GA_3140.FOSS to 7.1.3_GA_3346.FOSS.
In 7.1.0 server, I export one mailbox by the follwing command:
zmmailbox -z -m user@domain getRestURL '//?fmt=tgz&meta=0' >arch.tgz
In 7.1.3 server, after defining the same account, I re-import mailbox:
zmmailbox -z -m user@domain postRestUrl -u 'https://host.domain' '?//fmt=tgz&resolve=reset' arch.tgz
If I login to the imported mailbox and look at Sent folder, in the "TO" column of the mail list, I see the sender, not the recipient. Only the first row of the list shows the correct recipient: all lines below show the sender rather than the recipient.
The situation doesn't amend if I export with meta=1; in such situation, the list of sent mail show some lines with the right recipent and other with the sender in place of recipient.
Thanks for any help.