Github user Humbedooh commented on the issue:
https://github.com/apache/incubator-ponymail/issues/426
Suggestion:
add a max_nesting var (set it to something sane, like 12)
when levels go above that, remove the bs-callout and padding from the
email, letting it retain the same dimensions as the parent. While not the
perfect solution, it's probably the best compromise I can think of. It's either
that or we remove the nesting altogether, and I think that would be a bit much.---
