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An email storm (also called a Reply Allpocalypse, also called an eMaelstrom) is a sudden spike of Reply All messages on an email distribution list, usually caused by a controversial or misdirected message. Such storms start when multiple members of the distribution list reply to the entire list at the same time in response to the instigating message. Other members soon respond, usually adding vitriol to the discussion, asking to be removed from the list, or pleading for the cessation of messages. If enough members reply to these unwanted messages this triggers a chain reaction of email messages. The sheer load of traffic generated by these storms can render the email servers inoperative, similar to a DDoS attack.

A related phenomenon occurs when a subscriber to a mailing list emails the mailing list to "UNSUBSCRIBE". People will reply to the hapless individual on the mailing list, half of them advising on how to unsubscribe, the other half referring to the manual of the mailing list manager. More subscribers will reply to the previous round of respondents, again to the list, this time about mailing list etiquette.

Some email viruses also have the capacity to create email storms, by sending copies of themselves to an infected user's contacts, including distribution lists, infecting the contacts in turn.

Examples

On 14 October 1997, a Microsoft employee noticed that they were on an as-yet unknown email distribution list 'Bedlam DL3', and emailed the list asking to be removed. This list contained approximately a quarter of the company's employees, 13,000 email addresses. Other users replied to the list with similar requests and still others responded with pleas to stop replying to the list. A Microsoft employee estimates that 15 million emails were sent, using 195 GB of traffic.^[1]
On 3 October 2007, an email storm was generated at the U.S. Department of Homeland Security, causing more than 2.2 million messages to be sent, and exposing the names of hundreds of security professionals.^[2]
U.S. State Department employees were warned they could face disciplinary action for taking part in a massive email storm that "nearly knocked out one of the State Department's main electronic communications systems".^[3]
In November 2012, New York University experienced a reply-all email storm due to an older listserv-based mailing list. There were 39,979 subscribed addresses affected.^[4]
On 11 March 2013, over 8952 students from Imperial College London were subjected to an email storm after a final year medical requested to be removed from a mailing list, resulting in over 3.5 million email messages being sent. The mailing list was created, without permission, to advertise a campaign in the Imperial College Union Elections.^[5]^[6]^[7]
On 18 March 2014, over 47,000 employees of Capgemini were subjected to an email storm following the receipt of an internal vacancy email with an incorrect mailing list. The result was 430 emails sent to this mailing list in 4 hours (reply all) which represents 20 million emails (1.4 TB). Most of these emails were sent in order to signal a wrong recipient (or just to indicate "+1"), to request no further "reply all" emails, jokes, and explanations about how to create Outlook rules to immediately put emails in the trash.
On 17-18 May 2014, 220 emails were sent to 10,460 individuals (2.3 million emails in total) who were signed up to receive updates from the UK branch of the Personal Genome Project. This was due to people replying and including an incorrectly configured mailing list. The issue was contained by PGP-UK within 6 hours of the initial email being sent, and within 3 hours of the first reply-all. One person’s unique ID number, along with 220 email addresses and names were revealed to the entire mailing list, in some cases voluntarily so. 5 days after the incident, PGP-UK issued a full apology with a detailed description of the cause of the issue and the steps taken to contain and remedy the situation.
On 8 October 2014, an email storm of over 3,000 messages, including both spam and student comments, reached University College London's 26,000 students. The email chain was started by a prank email sent from an anonymous user pretending to be the provost.^[8]
On 26 August 2015, Thomson Reuters, a media and information firm, experienced a "reply all" email storm reaching out to over 33,000 employees.^[9] Seven hours later, the original email resulted in nearly 23 million emails. The storm was initiated by an employee located in the Philippines requesting his phone to be re-activated. Employees from all over the globe took to social media trending the hashtag #ReutersReplyAllGate.
On 2nd October 2015, Atos, a European IT services corporation, experienced a "reply all" email storm. In about one hour, 379 emails were sent to an email distribution list with 91,053 employees, leading to more than 34.5 million emails. The storm was initiated by an employee located in India, requesting a password reset for a machine.^[10]

Citations

^ "You Had Me at EHLO." Microsoft Exchange Team Blog. Retrieved 17 January 2009 from MSexchangeteam.com
^ Lisa Vaas, DHS Injects Itself with DDos, eweek.com, 4 October 2007
^ Reply-all e-mail storm hits State Department. Retrieved 17 January 2009 from Boston.com
^ Retrieved 2012-11-29 from 40,000 NYU College Students Realize They Can E-Mail All 40,000 People at Once
^ https://twitter.com/TheServiceDesk/status/311113373871919104
^ https://twitter.com/TheServiceDesk/status/311117673616535552
^ http://imperial.tab.co.uk/2013/03/12/yes-james-bromley-yes-it-does
^ Wakefield, Lawrence (9 October 2014). "#Bellogate trends after pranksters target UCL students' email". The Guardian. Retrieved 16 October 2014.
^ http://blogs.wsj.com/cmo/2015/08/26/reuters-employees-bombarded-with-reply-all-email-catastrophe
^ http://www.journaldugeek.com/2015/10/05/nouveau-record-une-petite-erreur-donne-lieu-a-38-242-260-mails/

References

Virus-induced email storms, University of Michigan

[You_Had_Me_at_EHLO-1] "You Had Me at EHLO." Microsoft Exchange Team Blog. Retrieved 17 January 2009 from MSexchangeteam.com

[2] Lisa Vaas, DHS Injects Itself with DDos, eweek.com, 4 October 2007

[Boston_Globe_Article-3] Reply-all e-mail storm hits State Department. Retrieved 17 January 2009 from Boston.com

[40,000_NYU_students_email_all_40,000_students_at_once-4] Retrieved 2012-11-29 from 40,000 NYU College Students Realize They Can E-Mail All 40,000 People at Once

[5] ttps://twitter.com/TheServiceDesk/status/311113373871919104

[6] ttps://twitter.com/TheServiceDesk/status/311117673616535552

[7] ttp://imperial.tab.co.uk/2013/03/12/yes-james-bromley-yes-it-does

[8] Wakefield, Lawrence (9 October 2014). "#Bellogate trends after pranksters target UCL students' email". The Guardian. Retrieved 16 October 2014.

[9] ttp://blogs.wsj.com/cmo/2015/08/26/reuters-employees-bombarded-with-reply-all-email-catastrophe

[10] ttp://www.journaldugeek.com/2015/10/05/nouveau-record-une-petite-erreur-donne-lieu-a-38-242-260-mails/

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 {{Use dmy dates|date=November 2013}}
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-An '''email storm''' (also called a '''Reply Allpocalypse''') is a sudden spike of Reply All messages on an [[email]] [[distribution list]], usually caused by a controversial or misdirected message. Such storms start when multiple members of the distribution list reply to the entire list at the same time in response to the instigating message.  Other members soon respond, usually adding vitriol to the discussion, asking to be removed from the list, or pleading for the cessation of messages. If enough members reply to these unwanted messages this triggers a [[chain reaction]] of email messages.  The sheer load of traffic generated by these storms can render the [[Mail Transfer Agent|email servers]] inoperative, similar to a [[Denial-of-service attack|DDoS attack]].
+An '''email storm''' (also called a '''Reply Allpocalypse''', also called an '''eMaelstrom''') is a sudden spike of Reply All messages on an [[email]] [[distribution list]], usually caused by a controversial or misdirected message. Such storms start when multiple members of the distribution list reply to the entire list at the same time in response to the instigating message.  Other members soon respond, usually adding vitriol to the discussion, asking to be removed from the list, or pleading for the cessation of messages. If enough members reply to these unwanted messages this triggers a [[chain reaction]] of email messages.  The sheer load of traffic generated by these storms can render the [[Mail Transfer Agent|email servers]] inoperative, similar to a [[Denial-of-service attack|DDoS attack]].
 A related phenomenon occurs when a subscriber to a mailing list emails the mailing list to "UNSUBSCRIBE". People will reply to the hapless individual on the mailing list, half of them advising on how to unsubscribe, the other half referring to the manual of the mailing list manager.  More subscribers will reply to the previous round of respondents, again to the list, this time about mailing list etiquette.