Hi! We've been having the same issue, but I think I just figured it out. Under 'Design' go to 'Buttons & Dividers' and change the color to white. Save and sent a test email to yourself - I did this and, NO LINES!! #Yaayyy I hope it works for you!!
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Under 'Design' go to 'Buttons & Dividers' and change that color to white or whatever the background color is. Send a test email to yourself and you will find no lines!
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OMG I've been having the same issue! But i think i just fixed it!!! Under 'Design' there next to Buttons & Dividers, change the color to white, or whatever your background is. Then i sent a test email to myself and there were NO LINES!! I am so happy about this!! LOL
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