Changing mail for user account

[Sławomir Dzimira]

if i will change an email address for user account would it clear his history in jira ? would he still have all tasks assign to his account etc. ?

[Nic Brough -Adaptavist-]

Welcome to the Atlassian Community!

Jira uses the account to identify the user, not the account's email address.  So, you're perfectly safe to change the email address of an account.