Should we include all contacts who have set external suppressions (do not want marketing emails) on the DNC list? For example, if we create a campaign to mark or add them as DNC, how do we apply this to all other campaigns? Or does the DNC campaign already handle this for other campaigns with promotional and marketing materials, especially broadcast emails?
If you mark people as DNC and you use ‘marketing email’ setting for your email step in your campaign, then DNC people won’t get those emails.
Segment emails are not sent to people with DNC.
As long as your DNC list is synched you are fine.