need to have incremental number

[Guest]

I need to have a field where incremental number will be create base on when
a e-mail will be receive.

This is to make sure that each email will receive a unique number.

Once that number is generated i need to be able to change it manually.

Finally i need to have a addon that will help me make some king of help
desk, Technical support.

 

[Brian Tillman]

I need to have a field where incremental number will be create base
on when a e-mail will be receive.

Don't multipost.