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Hey Jasmine, if you're needing these secondary email addresses for emailing, then you will need to create an additional record. Marketo is only able to mail to the native email address field that they store.
I believe you can use tokens in the "Send Alert" flow step (triggered campaigns only, I think, but you can always do the request campaign workaround).
I wouldn't recommend it. You'll loose all sorts of tracking/reporting info that way. But it would help you to not need the duplicates floating around your system. I'm the world's biggest advocate for data hygiene.
You can create a second field for alternate email address if it's different from the primary one. Then, you can run a report on leads that have an invalid email/hard bounce. If those leads with bouncing email addresses have a secondary email, I'd run a campaign to overwrite the invalid email address with the secondary email.
You can only send an email to the primary email, but keeping the secondary email as a replacement to the primary if it's invalid is a nice option to have.