Ha sido un placer

[Celeste]

Hi,
In spanish when someone thanks you for your help, I mean in a business letter, one of the possible replies could be "Ha sido un placer ..." or simply "Un placer" (more informal) is it correct in English to write It's been a pleasure or My pleasure
Thanks

 

[Masood]

If it was a business letter, I would say "It has been my/our pleasure to assist you with ...etc, etc". If YOU personally gave the help, say "It has been my pleasure...". If the company in general gave the help, say "It has been our pleasure..."
Por cierto, 'It has' en vez de 'It's' sonaría mejor en una carta comercial.
Hope this helps.
Masood.