Error code

Meaning

1

An exception has occurred.

3

The process has run out of memory.

4

An error has occurred due to a problem with the message body or attachments.

5

There was a problem initiating the conversation with the mail server. Ensure the setting of the Domain property is correct.

7

The from address was not formatted correctly or was rejected by the SMTP mail server. Some SMTP mail servers will only accept mail from particular addresses or domains. SMTP mail servers may also reject a from address if the server can not successfully do a reverse lookup on the from address.

8

An error was reported in response to a recipient address. The SMTP server may refuse to handle mail for unknown recipients.

9

There was an error connecting to the SMTP mail server.

10

There was an error opening a file. If you have specified file attachments, ensure that they exist and that you have access to them.

11

There was an error reading a file. If you have specified file attachments, ensure that they exist and the you have access to them.

15

No mail server specified.

16

There was a problem with the connection and a socket error occurred.

17

Could not resolve host.

18

Connected but the server sent back bad response.

20

Cancelled as a result of calling the Cancel() method.

21

The operation timed out while the host was being resolved.

22

The operation timed out while connecting.

24

ESMTP Authentication failed.

25

The selected ESMTP Authentication mode is not supported by the server.

26

ESMTP Authentication protocol error.

27

Socket Timeout Error.

105

Invalid license key.

-1

The EMail account of addresser has not config.

-11

Email Account cannot be null.

-12

Email Password cannot be null.

-13

Email Address cannot be null.

-14

SMTP Server address cannot be null.

-15

SMTP Server port cannot be null.

-16

SMTP Server Secure Password Authentication cannot be null.