What options exist for changing usernames transparently in Webmail?
60662
Dovecot user lookup fails when using username@domain format
89965
How to retrieve email address of current user?
135604
Can I change email content without stopping a journey?
1631
How can I change displayed name as sender?
145944
How do I change a username? (shortname and home folder)
21989
How can I programmatically reset a user's password
128970
How can I change my Minecraft username?
83541
How to send group mail in Outlook to multiple recipients, but have each recipient see their own name?
157689
Edit account creation message
49817
Change name on the main Stack Exchange profile
72668
Dealing with "difficult" usernames in targeted comments
101538
Changing From Email Address in SharePoint Designer 2010 Workflows
32551
Change guest username
15998
Email authentication without modifying DNS records
99513
postfix - how to prevent users from sending with another users name
32207
Way to list "Contact Us" email address on web site, yet reduce likelihood of spam?
97203
How to change a Windows username using the command prompt?