Приемлемо ли в деловом письме приветствие "Greetings, Mr..."?

Обычно пишут Dear (и имя) :
Dear Mr Brown
Dear John
Образец:
Mr Nikolay Roshin
ABC-company
Office 2002, Entrance 1B
Tverskaya Street
Moscow
RUSSIA 20 June 2004

Dear Nikolay,

I'm writing to you in regard of your enquiry. Please find enclosed our information pack which contains our brochures and general details on our schools and summer centres.

In England we have two schools, Brighton and Bath, both beautiful locations which I am sure you and your students will like. Our schools are located in attractive premises in convenient, central positions. Brighton is a clean and safe town with a beautiful bay and countryside nearby. Bath is one of the most famous historic cities in England, famous for its Georgian architecture and Roman Baths.

Accommodation is provided in host families chosen for the ability to provide comfortable homes, a friendly welcome and a suitable environment, in which students can practice English and enjoy their stay. We have full-time Activities Organisers responsible for sports, cultural activities and weekly excursions.
Please complete and return the enclosed registration form in order to receive more brochures and other promotional materials.

I look forward to hearing from you and later hope to welcome your students to our schools and summer centres.

Yours sincerely,

Tomas Green
Managing Director

Деловые письма начинают: Dear Sir/Madam или если известно имя адресата Dear Mr Smith

нормально, вот добрый день как то не поделовому

Начни как посчитаешь нужным.
Если хочешь выделиться -пиши как знаешь.. .
)))