[mattbeckman]

We've had "Add List-Unsubscribe Header" on Trello for a long time, but for some reason I had it in my mind that there was a ~60 character limit.

I appreciate the post because after revisiting it, I think that info was gathered from a few-years-old blog discussing a specific limit in (maybe?) Gmail, but it sounds like it can be broken down into multiple lines.

[crdrost]

I don't think there are "multiple lines", just that you can have quite large HTTP headers and this one happens to contain a comma followed by a space, which the text view is using to word-wrap.

See e.g. https://web.archive.org/web/20180605011201/https://www.list-... for a better example.