# NumberForm with fixed width and exponent as "e+00" or "e-02"

I wish to export a matrix of real numbers out to a txt file in which the entries have the MatLab form:

7.568627450980391913e-01
1.000000000000000000e+00
3.176470588235293935e-01


Code Export["out.txt", ScientificForm[out,19,NumberFormat->(Row[{#1,"e",#3}]&)], "Table"]; doesn't do what I want. How can I remedy this?

Thanks to andre314 for providing the link and avni for the code in this post, the solution is:
Eform[x_?NumericQ,d_:18]:=Module[{m,e,mm,ee}, {m,e}=MantissaExponent[x+0.0];m=m*10;