Error 101 Unable Connect – Causes and Fixes
The server is unable to connect or start an SMTP session. Causes Usually point to a configuration problem. For example,...
SMTP
Simple Mail Transfer Protocol Error Codes
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Error 111 Connection Refused – Causes and Fixes
Connection refused or incapability to open an SMTP stream. It is often related to firewalls or misspelled domains. Causes Referencing... -
Error 420 Connection Timeout – Causes and Fixes
Timeout connection problem. The server Administrator of the receiving mail will have the option to confirm the real issue only.... -
Error 421 Service Unavailable – Causes and Fixes
Service is unavailable due to a connection problem, please try again later. The message will continuing be attempted for delivery... -
Error 422 Exceeded Storage Limit – Cause and Fixes
Recipient mailbox has exceeded its storage limit. Causes It could be message delivery directory is running over sized Mailbox has...