wp-config changed as directed.
Here is content of debug.log:
[08-Dec-2012 00:47:47] Postie: activiated
[08-Dec-2012 00:47:47] Postie: Setting hourly cron schedule
[08-Dec-2012 00:47:47] Postie: activate completed
[08-Dec-2012 00:47:47] Postie: Setting hourly cron schedule
[08-Dec-2012 22:41:59] Postie: Setting tenminutes cron schedule
[08-Dec-2012 22:41:59] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/tpkiwi/public_html/blog/wp-content/plugins/postie/postie-functions.php:76) in /home/tpkiwi/public_html/blog/wp-includes/pluggable.php on line 881
[08-Dec-2012 22:42:26] Postie: Setting tenminutes cron schedule
[08-Dec-2012 22:42:26] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/tpkiwi/public_html/blog/wp-content/plugins/postie/postie-functions.php:76) in /home/tpkiwi/public_html/blog/wp-includes/pluggable.php on line 881