Decrypt mail passwords migrated to 10.4.4

[HoracioS]

I was migrated some mails from an old ENSIM PRO to Plesk 10.4.4.

Now, the problem is I need to decrypt the passwords. The format is:

| user1 | domain.ch | $1$RJkmEOmi$DkFCLamtZ9LSOA7TormD/. |

I tried to use the following but not helped:

# perl -MMIME::Base64 -le 'print decode_base64("$password")'

# perl -MMIME::Base64 -le 'print decode_base64("DkFCLamtZ9LSOA7TormD/.")'
AB-??g??8Ӣ??

What I´m doing wrong?

Many thanks for your help