"warm note" is correct and usable in written English.
You can use it to describe a letter or message that conveys warmth and friendliness. For example, if you send a friend a letter wishing them well, you could say you wrote them a "warm note".
It's a warm note with which to sign off.
That was followed by a warm note from his interviewers.
Later, Putin sent Trump a warm note and a traditional Russian wooden box, Agalarov said.
After his election, Reagan wrote Cohn, a registered Democrat, a warm note of thanks for his support.
My overnight stay at the new Marriott at South Beach in Miami began on a warm note.
For years, Tammaro had been Sting's stylist and groomer, and a warm note from Trudie Styler, Sting's wife, was posted in his guest bathroom.
I typed brief confirmations for various meetings, sent long-overdue R.S.V.P.'s and replied to a few friends who had sent warm notes of hello.
Those looking for a floral grounded with warm notes of sandalwood and sweet almond oil may appreciate the scent just for scent's sake.
Resin Sacra shower gel £30, Tom Daxon, mrporter.com The woody resin is blended with warm notes of sandalwood, patchouli and the sharp freshness of vetiver in this luxurious shower gel.
Then, to tweak the flavor profile, she recommends using an Indian chai mix instead of pumpkin pie spice — both have warm notes, but the chai will have more ginger, cardamom, and sometimes a little coriander and black pepper.
The fact that the scent is overtly sensual, with warm notes of patchouli and cedarwood mingling with brighter ones of bergamot and orange flower, comes as no big surprise from a man who has worn butt-less pants.
