When a shipment notification is sent from SKULabs to Shopify you may find in the Shopify order activity log a note indicating "SKULabs sent a shipping confirmation email".
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This is an internal log within Shopify that essentially means "SKULabs triggered Shopify to send an email notification".
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SKULabs does feature the ability to send shipment notification emails directly, however, this would not be logged in the order timeline on Shopify.
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If you are concerned about email delivery in SKULabs, please check our troubleshooting guide or reach out to us in chat for support.