It’s not the tone. It’s how you perceive the tone to be. Be careful, especially in a culturally diverse and international environment. Plenty of cultures cringe when they receive overly friendly phrased words, as it will not sound honest and curious to them but condescending and fake (in this context it may be perceived as sarcasm); whereas others will experience and mean it as straightforward openness.

Communication is hard. Even harder in writing. A usually working approach is to assume friendliness.