Do you have a development instance running somewhere that uses the same data? If so, the subscription could be configured on the test environment and sending duplicates.
Usually, I disable outgoing mail on dev servers either using the JVM startup option or just removing the SMTP server altogether - I don't typically find it necessary to test mail so I turn it off until absolutely necessary in dev environments.
http://confluence.atlassian.com/display/JIRA/Setting+properties+and+options+on+startup
-Datlassian.mail.senddisabled |
Set to 'true' to disable mail. In Linux setenv.sh, there is a pre-existing flag to uncomment. |
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