Gracias Cristina por tu pregunta! Hay muchas expresiones adecuadas en un email/carta profesional, pero depende en parte refieras. Solo hablando de las salutaciones formales tenemos los siguientes:
Formal Opening Salutation
Dear Sir/Madam, (If you do not know the person or the company you are writing to.)
Dear Mr Anderson,
Dear Ms Harrison, (If you do not know if the lady is married or not)
Dear Mrs Harrison, (If you do know that the lady is married.)
Dear Miss Harrison, (If you do know she isn’t married.)
Formal Closing Salutation
Yours faithfully, Yours sincerely
Otras expresiones para empezar un email/carta podian ser:
If your letter or email is the initial piece of communication, you can start with one of the following formal openings:
I am writing to you on behalf of Iberdrola, where I am responsible for* renewable energy.
Allow me to introduce myself: my name is Michelle Hanly and I am the person responsible for* renewable energy.
*Note – Responsible is not a noun. You can never say “I am the responsible of renewable energy”.
Sometimes you will be writing to somebody before or after something happens, like a meeting for example. In this case, you can start with the following:
In relation to our meeting next/last Tuesday, I am writing to you…
Y por último, algunas expresiones para terminar tu email/carta miramos los siguientes:
To finish on a formal level, you can use some of the following formal closings:
I look forward to hearing from you at your earliest convenience.
I would appreciate it if you replied to me before next Tuesday.
I think that is everything, but if there is anything else I can help you with, please let me know as soon as possible.
Once again, please do not hesitate to contact me if there is anything that you think I can help you with.
Espero que te ayudan estas frases basicas! Dime si tienes mas dudas!