email loops back from localhost

[Zsombor B]

Hi,

Can you help me please why does this fall into a loop?
postfix > localhost:11111 > localhost:11111 > localhost:11111 > etc.  
until too much hops.

--- main.cf:
transport_maps = hash:/etc/postfix/transport

--- /etc/postfix/transport:
recipi...@domain.com smtp:[127.0.0.1]:11111


--- master.cf
127.0.0.1:11111 inet n - y - - smtpd
   -o transport_maps=hash:/etc/postfix/custom_transport
   -o smtp_sasl_password_maps=hash:/etc/postfix/custom_auth

--- /etc/postfix/custom_transport
recipi...@domain.com smtp:[some.external.server]:25



Thank you
Zsombor