Client: "I did not receive the email that should be send after that event. Please fix."
Me:
* Checks code - ok
* Tests feature in locally - ok
* Tests feature in production - ok
* checks values in database - ok
* 2 hours wasted - ok
"Please help me dear CTO, idk what else I could check or how I should even respond to this."
CTO: "hmm, the clients account uses a adminstrative email address for testing. Let me just check if it is in the mailbox."
*checks* "Yeah, that's the email you're looking for, right?"
Me: *experiences relief, anger, blood lust and disappointment at the same time* "Could you please respond to the client for me, I need a break. Thanks"