malformed header from script 'index.pl'

[fdiazdelcastillo]

Dear friends, I'm having this situation:

When I click fetch mail in PostMaster Mail Account i received this message:

500 Internal Server Error

"Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at it@tacctica.com to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

Apache/2.4.7 (Ubuntu) Server at cs.eg-colombia.com Port 80"

Apache error.log shows:
[Sat Aug 22 08:29:53.358564 2015] [core:error] [pid 2560:tid 139864360068864] [client 186.82.75.37:50106] malformed header from script 'index.pl': Bad header: , re$
[Sat Aug 22 08:29:53.358699 2015] [perl:warn] [pid 2560:tid 139864360068864] /otrs/index.pl did not send an HTTP header

Mail are fetched, notifiations are sent, but i'd like to fix the reason why this message is being shown.

I appreciate your help.

[mindbard]

I am having this issue as well.
May I know what's the solution if you have solved it?