The best way to secure Webmail is with high-quality passwords. Make sure every user has a password that is a phrase (not a single word) with mixed upper-/lowercase or letters/numbers. Also use the address book option to "store Internet passwords in more secure format." Also, check the ACLs on each person's mail file, to make sure it is as tight as possible. There should be no access for Anonymous or Default. With these practices, it is nearly impossible for someone to break into a Domino Webmail account.
For more information on secure passwords, check out these tips written by Chuck:
Assigning unique initial passwords, which is a tip unto itself filled with member feedback to the second tip in the above list.
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