changed behavior for dovecot-lda in 2.3.x

Hi all,

Hey all, I upgraded to dovecot 2.3.1 (from 2.2.34) and noticed that the behavior for dovecot-lda changed. Apparently it no longer accepts -f "" or -f "<>? With 2.2.34, both were accepted now I get:

root@mail:~# /usr/local/libexec/dovecot/dovecot-lda -f "<>" lda(root): Fatal: Invalid -f parameter: Null path not allowed

or

root@mail:~# /usr/local/libexec/dovecot/dovecot-lda -f "" lda(root): Fatal: Invalid -f parameter: Path is empty string

I guess this must be a bug? I mean, envelope sender *must* be empty for bounces.

Thanks,

Martin