Careful relying on Gmail when sending bulk email. I have seen a lot of cases where that does not end well — your recipients won’t always get those emails, and your account can be automatically suspended.

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That said, I think it’s a useful thing! I don’t know why mail merge isn’t a lot more readily available. I don’t know why my email clients don’t allow me to list a bunch of email addresses as if they were all in their own “To:” fields; that is, multiple recipients with BCC-like blindness to each other.