As you can see above, you check stats of the _local_ SENDITSH file. I can understand that it's simple protection against malicious attack. I agree that it can work, however assuming that a webmail always runs on only _one_ machine.

In our environment it's not true and sometimes a redirect hash is not veryfied properly, because a DNS server directs a user to another front-end.

Could you please fix it? I think you can add any variable to a webmail configuration file instead of checking stats of SENDITSH file. What's your opinion?