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Clearing your cache and restarting Outlook is your best bet for resolving an Invalid Credential error.
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Learn how to integrate Gmail, Yahoo, and other internet email accounts into Outlook with step-by-step setup instructions for POP3 configuration.
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Control who can send to distribution lists in Exchange 365 with PoliteMail Syncronym. Set send-to permissions and prevent reply-all access issues.
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Learn how PoliteMail uses Sender ID and O365 Measurement to verify senders, detect spoofing, and enable accurate, secure email tracking in Outlook.
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Update your Microsoft Graph secret for PoliteMail via Entra Admin Center. Add a new client secret, copy the value, and replace the old one securely.
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Gain an overview of PoliteMail software upgrade procedures, including automatic updates for online users, steps for desktop add-ins, license considerations, release schedules, and best practices for maintaining the latest version.
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Set up the EWS Client in PoliteMail to expand distribution lists. Learn how to configure endpoints, cache data, and prepare for Microsoft’s 2026 deprecation.
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Learn which Microsoft Graph permissions PoliteMail needs for SSO, list expansion, and secure mail integration in Outlook and M365 environments.
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Learn how to deploy PoliteMail for Outlook 365 using a manifest link in the Microsoft 365 Admin Center for seamless organization-wide access.
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The latest updates to PoliteMail include a redesigned toolbar for easier editing, AI-powered translation with preserved branding, built-in image editing, improved SAML security, and enhanced contact filtering for faster searches.