In Jenkins, there is a way to send mail when the build starts. I know that there is an email notification after the build that sends mail to the specified recipients after a successful or unsuccessful build. Similarly, I expect something like advance notice.
There is also a conditional email, for example, if the username == null is sent to the address xyz@domain.com , otherwise send it to the requestor.
Tried: a couple of plugins, but did not help, since they were plugins after the build
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