Writing a Spanish business letter requires a different approach than when writing a personal or social letter. The style must incorporate a formal tone and presentation, making use of formal business Spanish. This means you cannot simply complete a direct translation from another language in Spanish, put it on your business letterhead and send it. It is important to start your Spanish business letter with the appropriate salutations and greetings.
Write your name at the top of the page, on the left-hand side, without your title.
Skip two lines and write your own address on the left-hand side of the paper as your normally would, to include appropriate commas and punctuation according to your own language.
Skip two lines and write the date of the letter according to formal Spanish structure. For example, 10 de mayo de 2010 for May 10, 2010.
Write the name and address of the addressee on the right-hand side of the paper, after skipping two more lines as follows:
A la atención del Sr. Alvaro Medina TTCB S.A. Avda. de la Constitución s/n 28077 MADRID
For titles to a man, it is appropriate to abbreviate Señor Don to Sr. D. For a woman's title, it is appropriate to use Sra. Dña, the short-form for Señora Doña. Only use Sra. for Señora if you know she is married and that is her preference.
The address does not make use of commas in the formal Spanish structure.
Skip a line and write your greeting and the full form title, along with the last name of the addressee, followed by a colon, not a comma. Use "Ëstimado" ("Ëstimada" for a woman) when you have a good business relationship with the addressee, followed by the first name. In cases when a solid business relationship is not established, use the greeting "Muy Señor Mío" for a man and "Muy Señora Mía" for a woman and leave out at the name.
Estimado Señor: Estimada Señora:
Muy Señor mío: Muy Señora mía