Gmail Help recommends setting your mail client to check for new messages no more than once every 10 minutes. The error appears to be a way for Google Apps to protect against robots or automated scripts, and also to stop and halt abnormal bandwidth utilization (upload and download) or abusing account activity such as using Google Apps as a storage space drive or transferring another mail account to Google Apps.Īnother reason for the invalid credentials or web login requires error to happen is having your mail checked too frequently. ' Your IMAP server wishes to alert you to the following: Invalid credentials (Failure)' When accessing your Google Apps email via IMAP by using any email client, such as Outlook, Mail, iPhone, Apple Mail or Thunderbird, the following error message may appear, requesting you to manually input your username and password again in order to authenticate with Google's GoogleMail IMAP server again: Some of our customers use Google Apps for their email, and may encounter this problem when using a desktop email client.
