Q: How to write an email to the editor inquiring about the current status of my paper?

Since it's been two months since you have submitted your paper, you should definitely send an email inquiry now. You can use this template to send your inquiry:

Dear Dr./ Mr./Ms. [Editor's Name],

I have submitted my manuscript titled [insert manuscript title] to your journal on January 10, 2017 and the status has remained "Editor assigned" since then. Since it has been two months since my submission, I was wondering if the status is not getting updated due to a techincal error. It would be great if you could let me know when I can expect the next status change.

Sincerely,

[Your Name]

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