167	The recipient name is ambiguous. Multiple matches were found.
168	The specified attachment was not found.
169	The specified attachment was found but could not be opened, or the attachment file could not be created.
170	The specified attachment was found and opened, but there was an error reading it.
171	The attachment file was created successfully, but there was an error writing it.
172	This implementation does not support the counted-string type.
173	There was a general failure that does not fit the description of any other return code.
174	There is not enough memory available to complete the requested operation.
175	The service, user name, or password specified is invalid, so logon cannot be completed.
176	One or more of the specified recipients were not found.
177	The data extension requested is not supported.
178	The function extension requested is not supported.
179	The operation was canceled by the user.
180	The user is not logged on.
181	A flag set using a flags parameter was invalid.
182	One of the parameters in the message was invalid.
183	A function parameter was invalid.
184	The specified session handle is invalid or no longer valid - for example, after logging off.
185	The specified user-interface identifier is invalid.
186	The size of the text string passed to the current implementation is too large.
187	The current implementation cannot support the number of files specified.
188	The current implementation cannot support the number of recipients specified.
189	The current implementation does not support the flag requested.
190	Unknown error encountered.
193	Windows messaging subsystem (MAPI32) is not installed properly.
194	The testing message was successfully transmitted to the Windows Messaging Subsystem. If your recipient does not receive your fax/mail, please check Microsoft Exchange(and its services) settings.