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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.

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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)
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.

4.3.10 Can send locally but not externally. Printer Friendly Email This FAQ Discuss

Typically this is a relay error. Make sure your mail server can relay for your MailMessage.From address. If that address is valid, you may need to allow relaying for your specific IP Address, or first authenticate before sending the email. See
4.3.5 Not a gateway or local host.
or
3.8 How do I authenticate to send an email?
for more information.

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