I don't currently remember the details, but once my script sent emails to thousands of users where only about 20 should have received them. That was a really frustrating day.
Another uncomfortable situation was not exactly written by me, but was the outcome of not good enough configuration. When an error was happening on the server, we were getting a separate error-reporting message by email. And once MySQL database crashed. Over a number of hours users' requests sent so many messages that they flooded the email server and nobody in our company could receive any more emails for the whole day or two. Later we switched error reporting to server-based solution which combines error events into types of errors and sends only one notification by email for similar cases.
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I don't currently remember the details, but once my script sent emails to thousands of users where only about 20 should have received them. That was a really frustrating day.
Another uncomfortable situation was not exactly written by me, but was the outcome of not good enough configuration. When an error was happening on the server, we were getting a separate error-reporting message by email. And once MySQL database crashed. Over a number of hours users' requests sent so many messages that they flooded the email server and nobody in our company could receive any more emails for the whole day or two. Later we switched error reporting to server-based solution which combines error events into types of errors and sends only one notification by email for similar cases.