When I forward emails from my personal account to the helpdesk, they are not turned into tickets. Other people can forward tickets fine.
Check the Incoming Email Log on Admin > Emails > Email Accounts for errors specific to your account.
Emails can be rejected because your personal email account is set up as a ticket account in the helpdesk. An account that can receive Deskpro tickets should not be used as an agent account. This is necessary to avoid email loops and other problems.