....
mailbox_command = /usr/libexec/dovecot/dovecot-lda -f "$SENDER" -a "$RECIPIENT"

virtual_alias_maps = hash:/etc/postfix/virtual_alias_maps
virtual_mailbox_maps = hash:/etc/postfix/virtual_mailbox_maps
virtual_mailbox_domains = sharewiz.net abcd.com
virtual_transport=dovecot

# Uncomment the following if dovecot-lda seems to hang.
#dovecot_destination_concurrency_limit = 1