How Should I Handle My Manager's Unjust Termination of My Company Email?

I am working in a reputed industry for the last two years. A few months ago, my new manager joined the department. After working together for approximately four months, he suddenly ordered the IT department to terminate my company email ID without informing me or HR. Even HR understands that this is wrong, but they can't go against my manager because he is the Head of Department (HOD). Overall, I am the sufferer, and I am in a very embarrassing situation both professionally and socially. Kindly suggest how to resolve this complication.

Regards,
Bimal Jha

Subject: Urgent Communication Regarding Email Blockage Issue

Dear [Promoter's Name], I am writing to bring to your attention an issue I have been facing with my email account. I have noticed that my email ID has been blocked since [mention date and time]. This situation has caused inconvenience and hindrance in my daily work.

I kindly request your assistance in resolving this matter promptly as it is affecting my productivity. Additionally, I have copied HR, the IT manager, and my reporting authority on this email for their awareness and support.

Given the urgency of the situation, I want to ensure that necessary actions are taken to rectify the problem at the earliest. I would appreciate it if you could acknowledge receipt of this email during our upcoming meeting.

I am also taking this opportunity to inform you that I am actively seeking new job opportunities. It is essential for me to protect my interests and ensure a smooth transition should the need arise.

I have prepared my resignation letter and have begun collecting all necessary testimonials and references. In the event of a sudden termination, I am prepared to forgo the notice period and report directly to the appropriate authority.

Thank you for your attention to this matter. I look forward to your prompt action in resolving this issue.

Sincerely