Hello @LauraP25363 ,
We're sorry to see you've run into this issue. This is a widespread bug with Microsoft Outlook that affects all ESP emails, not just Constant Contact. There are currently no legitimate workarounds for this issue, however, it only seems to affect Outlook. Microsoft is aware of the issue and we're closely watching for fixes that are made available. If any are made available, we will take advantage of them. The primary issue is that the lines are random, the next test or live send, they could end up in different positions or disappear entirely. That said, there are a couple potential workarounds you could try:
Change the color of your inner background to match the outer background This way if the lines appear they'll still be the exact same color, and won't be seen.
Drag a block like a divider next to the affected block to create a column layout. Add all the affected blocks to one column. Delete the block/divider in the other column, so that the content is back to one column. We've seen this workaround have some success, but nothing is guaranteed due to the sporadic nature of the glitch.
I've still gone ahead and tracked your case for our engineers, but again this is something we and other ESPs are having to rely on Microsoft to figure out, as it is only affecting Outlook 2016 and 2018.
... View more