Append same text to every cell in a column in Excel

How can I append text to every cell in a column in Excel? I need to add a comma (",") to the end.

Example:

email@address.com turns into email@address.com,

Data Sample:

m2engineers@yahoo.co.in
satishmm_2sptc@yahoo.co.in
threed_precisions@rediffmail.com
workplace_solution@yahoo.co.in
threebworkplace@dataone.in
dtechbng@yahoo.co.in
innovations@yahoo.co.in
sagar@mmm.com
bpsiva@mmm.com
nsrinivasrao@mmm.com
pdilip@mmm.com
vvijaykrishnan@mmm.com
mrdevaraj@mmm.com
b3minvestorhelpdesk@mmm.com
sbshridhar@mmm.com
balaji@mmm.com
schakravarthi@mmm.com
srahul1@mmm.com
khramesh2@mmm.com
avinayak@mmm.com
rockindia@hotmail.com

Solution

See if this works for you.

All your data is in column A (beginning at row 1).
In column B, row 1, enter =A1&","
This will make cell B1 equal A1 with a comma appended.
Now select cell B1 and drag from the bottom right of cell down through all your rows (this copies the formula and uses the corresponding column A value.)
Select the newly appended data, copy it and paste it where you need using Paste -> By Value

That's It!