Verify new contacts' email before mailing

A new contact's email is verified, and only valid addresses are added to the mailing.

• A new person in Copper is the trigger
• The email is verified via hunter
• Only valid addresses go to Keap
• No verifying addresses by hand

CopperPipedriveAffinityAutopilotCopperHubSpotKeapMauticSalesforceStripeKeapSendGridAWS SESBrevoDevinoEnkodGmailKeapMailjetMandrillMauticMicrosoft OutlookRuSenderSend EmailSendPulseSMSC.ruHunter