• 4.3 SMTP Protocol/Network Related Exceptions
• 4.3.1 The server specified in the SmtpServer property is not valid or not available
• 4.3.10 Can send locally but not externally.
• 4.3.11 550 x.x.x Unable to relay for xxxxx.
• 4.3.2 [COMException (0x8004020f): The server rejected one or more recipient addresses."]
• 4.3.3 Some of emails are rejected by some clients, but not all.
• 4.3.4 My mail server requires authentication. (503 This mail server requires authentication)
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• 4.3.5 Not a gateway or local host.
• 4.3.6 The specified protocol is unknown.
• 4.3.7 The specified protocol is unknown. Part 2
• 4.3.8 The server response was 452 Filesystem error - message not accepted.
• 4.3.9 The transport failed to connect to the server.

4.3.4 My mail server requires authentication. (503 This mail server requires authentication) Printer Friendly   Email This FAQ   Discuss

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