Here's some rough examples of spawn areas I generally consider unacceptable to spam on the Enemy Territory public campaign server:

Oasis

The initial allied spawn is a no-spam area, excluding around the the pump since that is an objective.

I consider it acceptable for allies to spam the flag hut somewhat. This is because it is their primary objective at this point.

Once allies have blown the wall, and the flag becomes secure for allies, axis should not be spamming anywhere near the flag. Roughly around the dynamited wall and the pump is perfectly fine - and may take exception when trying to hit someone manning the crew-served MG42.

Likewise, allies should not be spamming the courtyard that axis spawn in, although since the courtyard is fairly large and exits numerous - and they go straight into crucial areas the teams fight over, spamming immediately outside the exits is fine by me.

Radar

Generally on radar there are relatively few problems on this excellently designed map, the very occasional times when allies are held inside the house is unacceptable but if this happens the teams would have to be really bad.

Shooting right down the corridor from the truck is contentious, and excessive spam can be a rather boring, but there are other exits, particularily the other route which even has an alternative spawn location.

The axis spawn hut is roofed, it has lots of exits in very different directions and is near impossible to spawn camp in any major way. There is also an alternative spawn hut, which is also hard to camp too effectively (two exits plus the windows), axis can switch to main spawn, plus anyone 'camping' it is really just part of trying to attack the west radar parts.

Railgun

*Sigh*, the axis spawn on railgun, easily the worst part of any map to get camped in, thanks largely to poor map design which makes for a good example of how not to do it. on the one hand, there's loads of cover and height advantage for allies to use, on the other there's little real cover for axis and lots of apparently pointless things for axis to get stuck in, like the ditch with a railway in it. spamming anywhere behind the seperator wall is a no-no for me, and this would be the area I'd enforce the 'no spawn spamming' rule most strongly.

The allied spawn really isnt much of an issue, I wouldnt allow any spamming of the immedite spawn area, but rarely any problems here.

The flag is again a flag objective, so as usual mostly OK to attack it in any way, although if it seems a team is merely trying (and succeeding very well) to hold the respawing team in there then something might be required.

Battery

Due to the design of the map meaning most of the time axis and allies can shoot and spam each others spawn while still standing in their own. there's not really much scope for trying to stop people spawn spamming. However, I wouldnt be happy with axis repeatedly spamming right on the allied spawnpoints, espeically if ETPro is not being used with the stickycharge settings and the dynamitable backdoor mapscript.

Goldrush

I wouldnt allow any spamming of the initial allied spawn, or it's immediate exits.

I dont have any issue with spamming the middle spawn exits during most of the map, since it is an objective area - not only the spawnpoint but also the tank. Once the tank starts down the hill to tank barrier 1 however, the courtyard where the tank starts isnt somewhere that should be spammed.

The second/rear axis spawn itself should not be spammed, nor should the western exit (although that room's exit to the courtyard can be). The spawn may have an immediate exit onto the courtyard, but since that is a major fighting area th eteams battle for control over, all fighting on it much be allowed.

Fueldump

I find the initial allied spawn to be the only real problem area, it's easy to target with mortar or artillery while allowing for the spammer to stay near cover. The other spawns may occasionally feature enemy players running through it (which is OK in my book) or someone sitting there with some heavyweapon, but thats the same as any other spawn and at least takes some difficulty to acheive so it occurs less often and is less frustrating for players.

The area I would consider kicking for is shown with the strong blue circle, roughly bordered in the map by the road and the end of the wall. If the situation is very bad, I might do something about any spam in the lighter blue area (somewhere I wouldn't spam myself, and many other servers consider a camp area).

Enemy Territory & Spawncamping
Enemy Territory Advanced Server Guide

Enemy Territory & RTCW UK