now i shrink my test script to one line ;) ### for i in range(2): context.MailHost.send('bodytext', "rec@mail.com", "sender@mail.com", 'subj'+str(i)) ### The error occured with IE, with Firefox i cant replicate the error. Here is the output of the Z2.log when calling the script over URL directly. localhost- christian [24/Nov/2006:23:48:27 +0200] "GET /VirtualHostBase/https/dev.***.de:443/VirtualHostRoot/Christian/rangeEMAIL.p y HTTP/1.1" 204 210 "" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)" localhost- christian [24/Nov/2006:23:48:28 +0200] "GET /VirtualHostBase/https/dev.***.de:443/VirtualHostRoot/Christian/rangeEMAIL.p y HTTP/1.1" 204 210 "" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)" localhost- christian [24/Nov/2006:23:52:13 +0200] "GET /VirtualHostBase/https/dev.***.de:443/VirtualHostRoot/Christian/rangeEMAIL.p y HTTP/1.1" 204 210 "" "Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.8.1) Gecko/20061010 Firefox/2.0" tomorrow i will check the zdb debugger with the script. thx for the hints to solve the problem.