That kind of address would be perfectly acceptable. For the slim chance that it evokes the connotation with someone, that person would probably blame himself instead of you or your company.
Since that address is under an international domain, that connotation would require some suggestive context anyway ( or the 'suitable' mindset with the recipient - in that case, you most certainly wouldn't run into difficulties ... ).
If your legal department or corporate bigshots were really sensitive, the best-known two-letter abbreviations from the NS period (excerpt from here) would be:
It might be more relevant to ban modern abbreviations and codes that are popular with right-wing extremists and outright nazis, see here for examples. Relevant two-letter codes might be
Note that considering theses codes means quite a stretch.
Just in case someone is really paranoid over the issue, there are also a number of online dictionaries purporting to compile abbreviations commonly used in Nazi Germany (eg. this one). They contain mostly terms that have been in common use in the German language of that time, irrespective of the Nazi dictatorship.