Is this correct? - 'I am in bewilderment of whom should I write to'. Does this sentence sound alright?
I am bewildered as to who I should write to.

If you put 'to' at the end, use the nominative pronoun—this is the informal style. The formal is too awkward, I think:

I am in bewilderment as to to whom I should write.
Veteran Member114,965
SystemAdministrator: A system administrator takes care of the inner workings of the entire system. These users have the ability to promote, ban and modify other users.Teachers: Users in this role are certified teachers. This may include DELTA, CELTA, TESOL, TEFL qualified professionals. Email a scan of your qualification to an admin, if you wish to be considered.
Thank you.
Looking for ESL work?: Try our EFL / TOEFL / ESL Jobs Section!
I am bewildered as to whom I should write.
Regular Member823
Proficient Speaker: Users in this role are known to maintain an excellent grasp of the English language. You can only be promoted to this role by the Englishforums team.Trusted Users: Trusted users are allowed to use additional capabilities of the site such as private messaging to all users and various other advanced features. You cannot join this role unless you are promoted by an administrator.