Express Sieve Filter Causes No Mail Delivery An issue can arise when a client logs into their mailbox through the MailSite Express Interface that can cause all their mail to be rejected. This issue can arise when the Client creates a filter with a blank entry within the ?eFrom?f field and then selects the Reject option then presses the Update Filter without actually entering any other information within the filter. How can this happen? When the Client has logged into MailSite Express web interface they would go to the 'Options' page and select 'Filters'. Click on 'Add New Filter', within this page they would scroll down the page and select 'Reject' and then press 'Update Filter' now all their mail has rejected. The Explanation of the Filter:- The reason they have rejected all their mail is that they have created a rule with:- If From: contains with the Action - Reject As most email address will have a blank space somewhere in the 'From' header all mail will be rejected.