Is an encryped email actually encrypted in the sender's mail box? (as well as the recipient's)

Hello,Could anyone confirm the following?..

It seems that when an email is sent encrypted from a person to a person (both with id files) then the email stored in the senders “sent” folder is also encrypted.

HOWEVER, when an encrypted email is sent from a group mail file to a person (with ID file) then the recipient receives it encrypted BUT the email stored in the “Sent folder” of the group mail file is NOT encrypted (the key symbol shows in the view but it is not actually encrypted ($EncryptionStatus=0 and no $Seal field). Which means all people who have read access to the group mail in file can read the encrypted mails too.

Could anyone confirm that this is how it is supposed to work?