Wait for bdsmail initialisation

src/freedombone-app-bdsmail

     echo 'python2 get_address bdsmail-privkey.dat' >> /usr/bin/bdsmail_domain
     chmod +x /usr/bin/bdsmail_domain
 
+    # wait for domain to be generated by the daemon
+    sleep 10
+
+    bds_domain=$(bdsmail_domain)
+    if [ ! $bds_domain ]; then
+        echo $'Failed to get the bdsmail domain'
+        exit 8934638
+    fi
+
     # Create mutt configuration
     mkdir /etc/skel/.mutt
     echo 'set mbox_type=Maildir' > /etc/skel/.mutt/bdsmail
     echo 'set smtp_url=smtp://127.0.0.1:2525/' >> /etc/skel/.mutt/bdsmail
     echo 'set use_from=yes' >> /etc/skel/.mutt/bdsmail
-    echo "set from=username@$(bdsmail_domain)" >> /etc/skel/.mutt/bdsmail
+    echo "set from=username@${bds_domain}" >> /etc/skel/.mutt/bdsmail
     echo 'set spoolfile=/etc/bdsmail/mail/username' >> /etc/skel/.mutt/bdsmail
 
     # mutt configuration for the admin user