There are more and more problems being reported by people trying to use postfix 2.5.0. I haven’t gotten it to work myself as well. The error occurs during linking you will see a message related to “_sasl_set_path”.

Please use 2.4.7 as a stable version that works.

Update: It looks like on Leopard you don’t need to install SASL, somehow the default installed version does work. To use that you also need to adjust the makefile creation.

make -f Makefile.init makefiles \
CFLAGS=’-arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk’ \
-I/usr/local/include/sasl \
-DHAS_PCRE -I/usr/local/include \
-DHAS_SSL -I/usr/include/openssl \
-DHAS_MYSQL -I/usr/local/mysql/include/mysql’ \
AUXLIBS=’-L/usr/lib -lldap -lsasl2 -L/usr/lib -llber -L/usr/local/lib \
-L/usr/local/lib -lpcre \
-lssl -L/usr/local/mysql/lib/mysql \
-lmysqlclient -lz -lm’

There are still other people testing this, if you can test this as well please let me know the outcome.