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Hi @tygertyger,
Thank you for you comment. I think that you point out a very important matter regarding memos. Some people like to receive memos with links to interesting posts. Some don't and it is perfectly understandable. I expect that memos are only sent to people who gave their consent to recieve them. If this is not the case, I would suggest that you inform the person who sent you the memo to stop it.

I was asked if it was ok if they could send some memos to promote this post and I agreed. So it is partially also my fault. Sorry about that.

it is one thing to offer a service to people who are interested in getting memos- create a service people can sign up to - but spamming random people ...and these people are spamming a copious amount of unwilling people is going to get you a huge backlash ...

Thanks a lot for your feed-back. You are not wrong about that and I will have to think how to deal with it in the future.