Why would you need that? - Maybe a link to a page containing the longer text might be more appropriate in those cases?
html designer it's stupid, and need more size. Some possibility of being able to increase the size with parameters ... or it is redesign software and database
the size is hardcoded and not configurable via config-file/gui. I'm not too sure wheter we want to increase it in general (2k is quite a lot to append to each mail that leaves your system, especially if it's html-styling-data). You can open an enhancement-request at https://bugzilla.proxmox.com - for further discussion (also if others need that too and say so there we could reconsider) Thanks!
