Having gained extensive experience in using Redmine 5.11 throughout my career, I am confident that I can effectively resolve the issue you are experiencing with closing issues, as well as the problems with email delivery from Redmine. My skills in diagnosing and fixing software errors, coupled with my deep understanding of Redmine will be instrumental in this task.
Additionally, my proficiency in PostgreSQL and Python further complements my ability to handle this project efficiently. I have expertly used these languages in previous projects where accuracy and attention to detail were critical, similar to what your situation demands.
Lastly, I assure you of my unwavering commitment and availability to see your project through to completion. I prioritize client satisfaction and Timely delivery of 100% accurate results is my driving force. Therefore, choosing me would indeed be selecting diligence, expertise, and a person who values your objective as much as you do.