I have found a solution for my question.
I refused using *.oft in favor of *.msg. This code is working for me and saving images inline message:
$PathToMsg = "c:\message.msg"
$mailboxes = "user@domain.ru"
$outlook = New-Object -comObject Outlook.Application
$session = $outlook.Session
$session.Logon()
$mail = $outlook.Session.OpenSharedItem($PathToMsg)
foreach ($mailbox in $mailboxes){
$mail.Forward()
$mail.Recipients.Add($mailbox)
$mail.To = $mailbox
$mail.send()
}
Thanks all for your attention =)