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From Glyn Williams

Your correspondent Tim Lister, in failing to see the necessity for better spam filters, has himself missed the point (12 April, p 28).

Whitelisting (the practice of only accepting mail from known sources) does not work because many email users, especially businesses, expect – indeed, wish to – receive mail from people they do not know. They may be potential customers, afterall.

Blacklisting does not work because many spammers use a “one-time” sender’s name for each message.

The world does need better spam filters, and I am pleased to note that such methods are now becoming widely available.

Derby, UK