How do i send emails to a secondary email [WorkFlow]

Hello,

I want to create WORKFLOW, which sends emails to contacts. My contacts have two email, one primary and one secondary.
My question is how I can choose which email address to send the messages.Sometimes I need to send to primary , sometimes i need to send secondary.
(The Secondary email address is “special” its a Mail2sms).

Thank you.

Could you clarify what mean when you say “Sometimes I need to send to primary , sometimes i need to send secondary.”. How do you decide when to send to primary and when to secondary? Is it something as simple as only use the secondary address is the primary address isn’t set or is there some more complex business logic you want to use?