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Last tested: Jan 24, 2018
Nope, there's no limit. Tip: The email box accepts comma-delimited-values for ease-of-use.
⚠️ Highly unrecommended to use "Run as recipient" as this would result in A TON of queries being run.
However, there might be a limit on SMTP server, for example, 1000 on Sendgrid
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