Authentication Problems

• Exchange Autodiscover Is Missing or Not Configured Correctly
• SMTP Server Rejected the Connection Because Your IP Is Blacklisted
• How to Fix an Invalid Exchange Server URL in Mailbird Next
• Unsupported Exchange Version in Mailbird Next
• What to Do When Your Email Provider Does Not Support OAuth2 in Mailbird Next
• How to Fix OAuth2 Sign-In Problems in Mailbird Next

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Issues Sending or Receiving Emails

• Troubleshooting Exchange Autodiscover in Mailbird Next
• POP3/IMAP Protocol Mismatch and Wrong Port Settings in Mailbird Next
• Network Troubleshooting: DNS, Connection Refused, and Address Errors in Mailbird Next
• Antivirus or Firewall Blocking Mailbird Next
• Troubleshooting Exchange Autodiscover in Mailbird Next
• Account exceeded command or bandwidth limits — Known Gmail Issue

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General and Misc

• Proxy Support in Mailbird Next
• Fixing the "Internal Database Error" in Mailbird Next
• Blurry Text on External Monitors (Mailbird for Mac)
• How to enable IMAP for your email account in Mailbird
• Why Emails May Appear as "Read" or Disappear in Mailbird Next
• Yahoo - Incorrect username or password in Mailbird Next

Installation and Licensing Issues

• Chromium Safe Storage Alert

App Issues

• Long delays when receiving incoming emails in Mailbird Next