simple past vs past perfect - I just remembered or i have just remembered?

Suppose I wrote someone an email and told him something. After a few days, it occurred to me that I forgot to tell him about other things. What is correct in this situation:

• Hi marc, I have just remembered that I forgot to tell you about other things...

or

• Hi marc, I just remembered that I forgot to tell you about other things ...

Answer

I think both the sentences are correct.
The adverb Just is used both in the
simple past and present perfect and in the past perfect tense too. Just means
recently when referring to time. The distinction between American and the British English is being slowly lost. Even in informal or in formal context, there is no difference.

1.I just remembered that I forgot to tell you about other things.

2. I have just remembered that I forgot to tell you about other things

Both the sentences mean the same thing and are grammatically correct.