Email campaign 85% of mail were send failed

[mpatsi]

Hello 

I setup and send my mail to my customers but after some time a get a failed status and a message that was saying "85%" of your mail are not send because of not valid emails....I have seen that and from other users here in community, and i don't understand my email are all 100% valid i used squarespace before and i was sending email normal, but now i import put those email on shopify to start a campaign and i have this issue...does anyone knows what happen?

Thanks in advance

[Rosstheboss]

I'm having the same issue. Moving over from Mailchimp and only 5% of my emails sent out in my first campaign when 100% would send out in mailchimp.

Shopify, is there a reason for this?