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    Very good answer. I would only emphasize the importance of taking into account risks which come when using distributed transactions - mainly resource locking producing deadlocks and systems-halts. On an e-commerce product I worked on about 3 years ago we had to replace DTs with messaging system, because with the amount of users available in the systems, the system was very prone to errors. Problems with DTs mostly occur when a user base grows. Commented Aug 2, 2017 at 4:11
  • Hello mister Smith. Please disregard previous email. Your password is unchanged. We will now attempt 2/100 to update the password. You will be notified of success in a follow-up email. Commented Oct 14, 2020 at 11:59
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    Do you know any service doing that? Services rather tend to anoy users fewer as possible. On the other hand, imagine getting such email from your bank :-) . "Ey something went wrong here but it's ok, don't you worry". Not a big deal. Commented Oct 14, 2020 at 12:33