Why I get mail delivery failuer notices

Hi,

When I reply to a post in this list I get few mail delivery failuer
notices. I do remove other addreses in CC an do only keep
security-basics@xxxxxxxxxxxxxxxxxx

Any clue why I do get mail delivery failuer notices from somtimes
dozens of address which I believe have subcribed to this list?

--
Mustafa Qasim

me@xxxxxxxxxx
http://blog.mustu.info

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