I want to ask about are you using real personal email address on bitcointalk or invalid - temporary emails?
This is a personal choice. You can decide to use your personal email address or generate a separate email for this forum. And what do you mean by temporary email? Of course, email attach to your forum account is temporary and not permanent because you can change it if you want to.
Should I also change to invalid one? For safety reason.
Ideas?
No! Changing to invalid email address is not ideal. If you're too concerned about your security and don't want to use your personal email, you can create a random email and attach it. What matters here is you having access to the email you attached to your account.
Having invalid email address attach to your account already move you out of safety zone.