As a Frenchman in B2B Sales, selling into other countries for 20+ years, I have used a small particularity to stand out with some of my email salutations & closings.
I either use French (when the recipient is not):
Bonjour to start.
Cordialement to close.
This give a different flair & feel to the email, and helps me stand out. Though it can backfire depending on the email content and the recipient's perception of the French 😁
My other approach is to use the local language.
For reference:
Austria
Salutation
Hallo
Closing
Mit freundlichen Grüßen
Australia
Salutation
G'day
Closing
Cheers
Bulgaria
Salutation
Zdravey
Closing
Pozdravi
Czech Republic
Salutation
Ahoj
Closing
S pozdravem
Germany
Salutation
Hallo
Closing
Mit freundlichen Grüßen
Denmark
Salutation
Hej
Closing
Med venlig hilsen
Algeria
Salutation
As-salāmu ʿalaykum
Closing
Ma'a al-salamah
Estonia
Salutation
Tere
Closing
Parimate soovidega
Spain
Salutation
¡Hola!
Closing
Un saludo
Finland
Salutation
Hei
Closing
Ystävällisin terveisin
France
Salutation
Bonjour
Closing
Cordialement
Croatia
Salutation
Dobar dan
Closing
S poštovanjem
Hungary
Salutation
Szia
Formal Salutation
Tisztelt
Closing
Tisztelettel
Iceland
Salutation
Halló
Closing
Með kveðju
Italy
Salutation
Buongiorno
Closing
Distinti saluti
Luxembourg
Salutation
Moien
Closing
Avec mes meilleures salutations
Netherlands
Salutation
Goedendag
Closing
Met vriendelijke groet
Norway
Salutation
Hei
Closing
Med vennlig hilsen
Poland
Salutation
Cześć
Closing
Pozdrawiam
Portugal
Salutation
Oi
Closing
Com os melhores cumprimentos
Romania
Salutation
Salut
Closing
Cu stimă
Sweden
Salutation
Hej
Closing
Med vänliga hälsningar
Slovenia
Salutation
Pozdravljeni
Closing
Lep pozdrav
Slovakia
Salutation
Dobrý den
Closing
S pozdravom
Turkey
Salutation
Merhaba
Closing
Saygılarımla
Tanzania
Salutation
Jambo
Closing
Kwaheri
United Arab Emirates
Salutation
As-salamu alaykum
Closing
Ma'a al-salamah