Hello, yes, you can do that.
Check the part "Hide mail in website url" there -> https://www.sogo.nu/news/2024/sogo-v5100-released.html
After restarting sogo, you will also need to restart your memcached server and expire all current session with the command sogo-tool expire-sessions 0

Note that the dav url won't be changed, though. We made that choice to keep all previous caldav configuration still operational.

@qhivert: Thanks for your answer but it is not enabled by default and badly it is not perfect.

On https://www.sogo.nu/news/2024/sogo-v5100-released.html:

Hide mail in website url

SOGo website use your email in its url like this:

• https://my.sogo.website/SOGo/so/qhivert@snapshot.alinto.org/Mail/view#!/Mail/0/INBOX
  New parameters will encrypt this so you url will look like something like this:
• https://my.sogo.website/SOGo/so/pz84d5jNOtDkeII5AAGl0Y5l35IDcGHZ5d8GLTOcVCM-/Mail/view#!/Mail/0/INBOX

To do that set those parameters in your sogo.conf:
SOGoURLEncryptionEnabled = YES;
SOGoURLEncryptionPassphrase = "16_chars_secrets";

But there is always an IDENTIFIER, my request is to have nothing instead of email address or username (identifier too).

Some examples with sogo1, sogo2, sogo3 accounts (second solution is perfect):

• https://demo.sogo.nu/SOGo/so/sogo1/Mail/view TO https://demo.sogo.nu/SOGo/so/Mail/view OR BETTER https://demo.sogo.nu/Mail/view
• https://demo.sogo.nu/SOGo/so/sogo2/Mail/view TO https://demo.sogo.nu/SOGo/so/Mail/view OR BETTER https://demo.sogo.nu/Mail/view
• https://demo.sogo.nu/SOGo/so/sogo3/Mail/view TO https://demo.sogo.nu/SOGo/so/Mail/view OR BETTER https://demo.sogo.nu/Mail/view

Can you solve it completely?

Thanks in advance.

Not for the current version, it would need a complete rework.
The good news is we are doing the next version from scratch and it won't have any id in the url -> https://www.sogo.nu/news/2025/fosdem-and-future-of-sogo.html