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As it can only accept 10 numbers and would need a lot of updating, I'm thinking now it would not be right for me. I occasionally visit my ISP's webmail page where anything unwanted can be identified as 'junk' and also have MailWasher. Taking all into account there could be up to 2,000 emails in some weeks.
One mistake was when I created a website with numerous sub-sections and used too many variations of my email address. I could put anything in front of the @ and they were all picked up by spammers as separate addresses. Thank you all for your interest.