Hi hospedagenscocar My apologies but I can only offer support in English. '''Google Translate: ''' When migrating a site, I made backups of the server's e-mails. I created the same accounts on the new Server and with the same passwords. I changed the DNS to the new server (thinking about uploading the emails from my machine to the new provider). As the settings were identical, there was an overlap of the old provider's emails and I lost everything. Is there a way to recover the emails from the old provider in a Thunderbird folder? '''My Answer in English''' >1. When migrating a site, I made backups of the server's e-mails. Perhaps you can get the missing email from the backup? Or switch the DNS back to the old server, get the email and copy the old emails to a Thunderbird local folder and switch the DNS back to the new server? >2. Is there a way to recover the emails from the old provider in a Thunderbird folder? If you saved the email to a local folder on Thunderbird you can get the email from TB's local folder If you didn't then: I believe that if you use IMAP and the email is not on the new server then when the new server connects it will erase the old email in Thunderbird's IMAP folders. This is how IMAP works; this not a Thunderbird issue. Hope that helps a wee bit! ...Roland