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Wells Fargo experienced the same thing in 2016: https://www.nysscpa.org/news/publications/the-trusted-professional/article/reply-all-brings-wells-fargo-to-knees

• saagarjha 7y ago
  On a lesser scale, I know that some companies have issues with emails that end up being sent up to huge mailing lists ballooning into huge chains when people try to get removed from the list and decide the best way to do so is to reply all to the email.