It doesn't appear to be due to the single word alone. The email also gets points for eumx being listed in a blocklist (apews.org) and there's a local score configured for the IP address. Presumably eumx has been sending a lot of spam to VFEmail.
There is no lab. ZRT simply means limited liability company and INVITECH MEGOLDASOK translates to Invitech Solutions - it's eumx's ISP.
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