My ISP has recently changed their e-mail filter system. To 
make maximum use of the new system I have been looking 
carefully at the headers I receive with my e-mail messages.

I always use as my e-mail address
[log in to unmask]

By saying to the filter "deliver [log in to unmask] but 
delete everything else" I can loose a great deal of spam.

I subscribe to a number of e-mail lists, which seem to use 
the headers differently. The e-mails I get from them have
Envelope-to: [log in to unmask]

I could include [log in to unmask] in the "deliver" 
filter but that would also let through a quantity of 
unwanted mail.

I never use the suffix .clara.co.uk, so how is it that 
these e-mail lists can change from one form to the other? I 
would welcome information on how they do this and why.

Regards

Tony

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