I can't send email gift tokens to ALL my customers ARE TalkTalk and Tiscali blacklisted?

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I've had a couple of very long chat conversations with shopify and it turns out - i need to tell any TalkTalk or Tiscali customers that they won't receive a Gift Card and that they should speak to their providers. Are there any other emails that are blocked?  It appears that TalkTalk and Tiscali have blacklisted Shopify so not a very good choice to go with, The chat team are asking me to get the Shopify removed from the blacklists.