email - Will one bad address stop delivery to good address when sending to multiple addresses via Mailgun -

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i sending emails webapp using javascript->firebase->zapier->mailgun. works. want send same (not customized each recipient) email 2 or 3 addresses. trying decide if should send multiple emails or send 1 email multiple addresses (separated commas) in "to:" field.

1) if send 1 email multiple email addresses, 1 bad email address (properly formatted, not deliverable) prevent other email addresses receiving email?

2) answer different if used multiple email addresses in "bcc:" field?

3) lastly, if 1 bad email address not prevent delivery addresses, there performance reason choose between sending multiple emails or sending 1 multiple addresses in "to:" or "bcc:" field? (i'm not worried few seconds or minutes delay non-time-critical emails, i'm more concerned about being citizen mailgun, i'm free-tier user.)

thanks in advance help.


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