It is possible to create a default domain for the POP3/IMAP, so that Users will only be required to supply their username, without the domain.You can specify a default domain by doing the following:

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Within Apache 2 the mod_deflate module can be used to automatically compress the output of the @Mail interface to the users-browser. Any recent browser supports HTTP compression ( e.g IE, Firebird, Mozilla, etc )

Compression can increase the performance dramatically for users on a slower link ( e.g dialup or congested network ) . The mod_deflate feature can compress between 15-60%+ of HTML output via the Webserver.

To enable compression support, verify you are using a recent copy of Apache2 and the following is enabled in the httpd.conf:

# cat httpd.conf | grep deflate
LoadModule deflate_module modules/mod_deflate.so

If loaded, specify the following at the bottom of the httpd.conf:

# Compress all HTML/text output
AddOutputFilterByType DEFLATE text/html text/plain text/xml 

# Log the compression to deflate_log , use for debugging and to verify the feature is enabled
DeflateFilterNote ratio

LogFormat '"%r" %b (%{ratio}n) "%{User-agent}i"' deflate
CustomLog logs/deflate_log deflate 

Next, save the changes and restart Apache. Once loaded @Mail will output all HTML pages with compression, if supported by the users browser.