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Hey. Here's the list of email platforms that has a native integration with HubSpot https://app.hubspot.com/ecosystem/3426102/marketplace/apps/marketing/email Not sure what you meant by cold emails though. If you're looking to send bulk marketing emails, HS has a pretty solid integration with Mailchimp. For cold outbound, standard email marketing tools aren't the best way to go about it.

Check if Smartlead has this...Apollo is quite expensive but offers some features for good deliverability

Do you have an email/domain that is warmed up to send these emails via SES, etc?