reminder of an / the e-mail I sent on December 12

Leafka

Senior Member
Polish
Hi,

I am writing a reminder to a person that has not responded to my e-mail:

'This is a friendly reminder of an / the e-mail I sent to you on December 3, 2014 (please see the e-mail below). I would be grateful for a prompt response.'

I am not sure which article to choose. I am mentioning the e-mail for the first time; but it's the only e-mail I sent to this person on December 3.
 
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