16.4 POP3 login with complete name format
Configure POP3 login with complete name format, go to: Users >> Authentication.
For POP3 authentication, there have a option to send the complete username with postfix or username only.
Username Format: When Complete option is checked, both the username and postfix will be transferred to the
POP3 server for authentication. When Only ID option is checked, only the username will be transferred to the
external server for authentication.
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