Formatting Problem in Recipient Emails

Hello - some of my campaign recipients are reporting that the emails they receive are unreadable because there are large spaces between the paragraphs. When I say large, a short email with about 6 paragraphs ended up covering 11 pages!

I am using a simple text template. I’d be grateful for any ideas please.

Hi @mel , thanks for posting on this community!

Could it be linked to the fact that these recipients using the same inbox provider?