Hi,
What version of the SSIMAIL.DLL are you using? What is the date of the file? You can find the file in the Softrak\System folder on your server.
There was an issue some time back where the time of the email was not adjusting for GMT that has been fixed in the SSIMAIL.DLL. You may need to upgrade to a current version of Invoices.
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Regards,
Softrak Tech Support