[k-9-mail] K-9 Mail with Alias and encryption

[p***@gmail.com]

Hi,

- i installed K-9 Mail and OpenKeychaine
- i add a normal mail-account with a PGP-Key
- then i add an Alias-adress for this mail-account (also with a PGP-Key)

- when i write a new mail and i choose the alias as sender (from-adress),
then i get the green lock (mail is encrypted)
- but when try to send the mail, i get the mesage that there is no key
configured for this account

I tried everything, but it seems that it is not possible to use an Alias
with encryption.

is it a bug?