I haven't heard any news from you about the certification
or
I haven't heard any news from you concerning the certification
or
I haven't heard any news from you in regards to the certification
29 de mayo de 2015
2
0
0
Simply start with the subject pronoun. Leaving out the subject pronoun can be acceptable in informal emails, for example.
29 de mayo de 2015
0
0
¿No has encontrado las respuestas?
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