How to recover mails of deleted mail account from .thunderbird directory?

How to recover mails of deleted mail account from .thunderbird directory?

I was using a gmail account. Now my TL deleted that gmail account. I was
using mozilla thunderbird as mail client. Also it got disappeared from my
mozilla thunderbird . but I found that all those mails are stored in
.thunderbird folder. How can I restore all those mails? Its stored in
.thunderbird/6s4amxw6.default/ImapMail/imap.googlemail.com/INBOX , an XML
like file.How can I recover mails from that file?