The whistleblowing organisation went ahead with publishing despite an orchestrated cyberattack on its servers, and an attempt by the government to block the website in Turkey.
The most recent email in the trove was sent on 6 July 2016, a week before the coup, dating back as far as 2010.
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What is in the WikiLeaks release?
WikiLeaks said the release of 300,000 emails, with several thousand attached files, is just the first in the series and encompasses 762 mailboxes from "A" to "I".
Accompanying the leak, it said on its website: "It should be noted that emails associated with the domain are mostly used for dealing with the world, as opposed to the most sensitive internal matters."
True to its word, there is plenty of spam from Nigerians with fortunes to bequeath upon you, conspiracy theories and press releases.
In pictures: Turkey coup attempt
Show all 17
In pictures: Turkey coup attempt
1/17
Turkish President Erdogan attends the funeral service for victims of the thwarted coup in Istanbul at Fatih mosque on July 17, 2016 in Istanbul, Turkey
Burak Kara/Getty Images
2/17
Soldiers involved in the coup attempt surrender on Bosphorus bridge with their hands raised in Istanbul on 16 July, 2016
Gokhan Tan/Getty
3/17
A civilian beats a soldier after troops involved in the coup surrendered on the Bosphorus Bridge in Istanbul, Turkey, 16 July, 2016
REUTERS/Murad Sezer
4/17
Surrendered Turkish soldiers who were involved in the coup are beaten by a civilian
Reuters
5/17
Soliders involved in the coup attempt surrender on Bosphorus bridge
Getty
6/17
Supporters of Turkish President Recep Tayyip Erdogan wave flags as they capture a Turkish Army vehicle
Getty
7/17
People pose near a tank after troops involved in the coup surrendered on the Bosphorus Bridge in Istanbul, Turkey, 16 July, 2016
A Turkish military stands guard near the Taksim Square in Istanbul
Reuters
10/17
Pierre Crom/Twitter
11/17
Turkish soldiers secure the area as supporters of Recep Tayyip Erdogan protest in Istanbul's Taksim square
AP
12/17
Murad Sezer/Reuters
13/17
Turkish soldiers detain police officers during a security shutdown of the Bosphorus Bridge
Reuters
14/17
Turkish Army armoured personnel carriers in the main streets of Istanbul
Getty
15/17
Chaos reigned in Istanbul as tanks drove through the streets
EPA/TOLGA BOZOGLU
16/17
Turkish President Tayyip Erdogan speaks to media in the resort town of Marmaris
Reuters
17/17
Supporters of President Erdogan celebrate in Ankara following the suppression of the attempted coup
Reuters
1/17
Turkish President Erdogan attends the funeral service for victims of the thwarted coup in Istanbul at Fatih mosque on July 17, 2016 in Istanbul, Turkey
Burak Kara/Getty Images
2/17
Soldiers involved in the coup attempt surrender on Bosphorus bridge with their hands raised in Istanbul on 16 July, 2016
Gokhan Tan/Getty
3/17
A civilian beats a soldier after troops involved in the coup surrendered on the Bosphorus Bridge in Istanbul, Turkey, 16 July, 2016
REUTERS/Murad Sezer
4/17
Surrendered Turkish soldiers who were involved in the coup are beaten by a civilian
Reuters
5/17
Soliders involved in the coup attempt surrender on Bosphorus bridge
Getty
6/17
Supporters of Turkish President Recep Tayyip Erdogan wave flags as they capture a Turkish Army vehicle
Getty
7/17
People pose near a tank after troops involved in the coup surrendered on the Bosphorus Bridge in Istanbul, Turkey, 16 July, 2016
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