@Snowman15 
try this once -> use wild card along with NOT LIKE operator

var gdt = new GlideDateTime();
var ms = 65 * 60 * 1000; // 65 minutes in milliseconds
gdt.add(-ms); // subtract 65 minutes

var encodedQuery = [
'u_accountISEMPTY',
'mailbox=sent',
'sys_created_on>=' + gdt.getValue(),
'target_tableSTARTSWITHsn_customerservice',
'target_tableENDSWITHcase',
'recipientsNOT LIKE%@hotmail%'
].join('^');

return encodedQuery;

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