Learn about specific Email error codes and messages in this section.
- List of SMTP and ESMTP Error Codes
- Email error 450
- Email error 421
- Email error 553
- Email error 550
- Email error 554
- Email error 551
- Email error 552
This section includes various email troubleshooting tutorials.
- Email Troubleshooting
- What is the max email attachment limit?
- Communicating with an email server using TELNET
- Locate email delivery times for an email address
- Find email forwarders or autoresponders
- Domain example.com has exceeded the max defers and failures per hour
- How our automated IMAP archiving works
- Possible server resource usage problems when using IMAP
- Create email account error: No such file or directory
- A review of IP Addresses listed in email headers
- Locate email accounts being used to spam
This section covers problems related to the various email clients.
- Outlook 2010: Server Rejected your Login
- Outlook 2010: The server you are connected to is using a security certificate that cannot be verified
- I am logged into webmail but I am missing emails
- I cannot log into webmail
- Windows Live "One or more messages in your Outbox" error
- Thunderbird - SSL warnings
- Thunderbird - Timeout
- Thunderbird - Configuration could not be verified - is the username or password wrong?
- Mac Mail - Cannot Send Message Using the server
- Disable IMAP IDLE in Mac Mail
- Send mail via Gmail when server IP is blocked
Exim Related Tutorials:
If you want to learn about Exim, this section provides helpful tutorials.
- Find spam script location with Exim
- Manage the Exim mail queue via SSH
- Process a backed up Exim mail queue
- Locate spam activity by subject with Exim
- Manage the Exim mail queue in WHM
- Find email delivery failures in Exim
- View full summary of mail activity from the Exim mail log
- View a summary of the Exim mail queue