Is your feature request related to a problem? Please describe.
The Servers of my hosting provider (https://ovh.es/) only add spam-headers of the format:

X-VR-SPAMSTATE: SPAM
X-VR-SPAMSCORE: 800
X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgedvtddrudejiedgheehucetufdoteggodetrfdotffvucfrrhhofhhilhgvmecuqfggjfdpvefjgfevmfevgfenuceurghilhhouhhtmecuhedttdenucgorfhhihhshhhinhhgqdfuohhrthfjughrucdlfedttddmnegohfhorhgsihguuggvnhfjughrucdlhedttddmnecujfgurhephffufffvtgfgsehhjedttddttdejnecuhfhrohhmpeeulhhoohguucfrrhgvshhsuhhrvgcujfgvrghlthhhuceonhhorhgvphhlhiesphhhohhnhhhordhnvghtqeenucggtffrrghtthgvrhhnpeehfffhheeltedttdfgleejveejteffjeehjeduueejjeeileehleeuudffgefhleenucffohhmrghinhepnhhuihguhidrtghomhenucfkpheptddrtddrtddrtddpgeehrddugeekrddutddrvddtvdenucfhohhrsghiugguvghnjfgurhephffufffvtgfgsehhjedttddttdejnecurfhhihhshhhinhhgufhorhhtjfgurhepfffghffuvfgtsehhjedttddttdejnecuufhprghmkfhppfgvthifohhrkhepgeehrddugeekrddutddrvddtvdenuceurggutfgvphhuthffohhmrghinhepphhhohhnhhhordhnvghtnecuvehluhhsthgvrhfuihiivgepfeenucfrrghrrghmpehmohguvgepshhmthhppdhhvghlohepihhnfedvrdhmrghilhdrohhvhhdrnhgvthdpihhnvghtpedtrddtrddtrddtpdhmrghilhhfrhhomheppdhrtghpthhtoheprggumhhinhesthgvmhgtohdrvghs

The add-on does not seem to recognize these. No Scores are shown.

Describe the solution you'd like
Add support for parsing these header fields in addition to X-VR-SPAMSCORE[...]