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.

6

There was an error terminating the conversation with the SMTP mail server.

7

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

8

An error was reported in response to receipt 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 the 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 that 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 server sent back bad response.

19

Could not create thread.

20

Canceled 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.