The .mailmap feature is used to coalesce together commits by the same
person in the shortlog, where their name and/or email address was
spelled differently.

For further reference see the man page of git shortlog

# Finding out duplicates by comparing email addresses:
git shortlog -sne |awk '{ print $NF }' |sort |uniq -d

# Finding out duplicates by comparing names:
git shortlog -sne |awk '{ NF--; $1=""; print }' |sort |uniq -d
---
 .mailmap | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 .mailmap

diff --git a/.mailmap b/.mailmap
new file mode 100644
index 0000000..8cd56bf
--- /dev/null
+++ b/.mailmap
@@ -0,0 +1,4 @@
+Miguel Ángel Arruga Vivas <[email protected]> Miguel Angel Arruga Vivas 
<[email protected]>
+Daiki Ueno <[email protected]> Daiki Ueno <[email protected]>
+Guido Flohr <[email protected]> Guido Flohr <[email protected]>
+
-- 
1.8.2.1.538.gad77690


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