<https://forums.cpanel.net/threads/webmail-authentication-problems.180591/>
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"Hi,\r\n\r\nI am finding on our servers that Safari, once it has logged into webmail once, is then unable to do so again unless the cache is cleared (Reset Safari). Firefox and IE8 seem unaffected.\r\n\r\nThe server just responds with an authentication error.\r\n\r\nThis happens on 11.28.52 and .54\r\n\r\nAnyone else had reports from users of this problem?"
<https://forums.cpanel.net/threads/webmail-authentication-problems.180591/#post-818281>