After some debugging I figured out the compressed js containing this
,define("text!scheduler/template/editor/notificationsTabTemplate.htm",[],function(){return'<!-- PPM Customization -->\r\n<!-- Added UI Input Text limit to 100 matching DB Field limits -->\r\n<!-- PPM Customization -->\r\n<div class="notificationsTab">\
this does not make sense, at least the above comment as Table "PPM_JASPERSOFT"."JIREPORTJOBMAILRECIPIENT" stores the addresses with each address limited to 100 characters, jasper puts comma separated emailids into separate rows anyways, that makes me feel that the input text can be unlimited.
I am trying to override this customization and will keep all posted if I succeed..
Nika_Hadzhikidi, what do you think?