Last week, we have sent our PreviewMyEmail.com email campaign and noticed some white lines after images in the email content in Gmail (click here to view the Gmail screen shot).
Gmail has changed how they render HTML images. Unfortunately, it adds spaces after images which may be breaking your HTML email layout just like in our recent email campaign.
As mentioned in theemailguide.com, this issue can be fixed by adding “display:block” style to every single image tag inside your HTML code. However, please note that this may cause another problem if the image is in a paragraph.
p.s.: Thanks to Richelo for sending us the link