Thank you for testing that Support Copy! What you are experiencing is something we are currently looking into further; in fact I have submitted this experience to the appropriate teams. In some cases combining blocks into one can help reduce the line, which is what Evan previously did. I took these same steps in the Support Copy. Because you still see the lines, I suggest changing the Outer Background Color of your email to match the Inner Background Color.
I am also seeing white lines on my email only in the test email. It looks perfect in preview mode but not when I send the test email. I'm also seeing a difference in the text at the bottom. It's centered in preview but on the edges in the test. What can I do?
I see you reached out to us on Twitter. I have responded and will continue to assist you there.
We're very sorry this is happening within your email campaign as well! Please know that we are tracking this for our engineers who are working to fix it as quickly as possible. In the meantime, the workaround is to change the Outer Background Color to match the Inner Background Color. Within the editor, click the Design tab, and then you can click the color squares to change the background colors:
Thank you for reaching out to the Community!
I am sorry to hear that you are running into this issue. I highly suggest trying the suggested workaround above. If this does not fix the issue then please send an email to social_support(at)constantcontact(dot)com with your username, a brief description of the issue and the name of the email that you are working on. We'll hop in and take a look! In the meantime, please let us know if you have additional questions.
Thank you for using Constant Contact, have a great day!