type of stream
typedef void * ServerStream;



SMTPReqCallback type for callback function that will call for each request, after request received, before server do anything other.
typedef int (* SMTPReqCallback)(ServerStream * stream, char * reqname, int action, ...);
Parameters:
The stream may be used by host program for next request.
The reqname it is name of requested file.
The action defined there: ACTION_POP_LOGIN ACTION_POP_GETMSG ACTION_POP_DELMSG ACTION_SMTP_CONNECT ACTION_SMTP_SENDMSG
Return value:
If this callback return zero, the server will still work the request.
If this callback return subzero the server understand that host program
If this callback return value above zero, the server return it to client as error code and return error page.

ALL_ACTIONS


MsgCallback type for callback function that will call for each change state in send msg request.
typedef void (* MsgCallback)(ServerStream * stream, void * usr_par, int state, int sent);
Parameters:
The stream -- may be used by host program for next request.
The usr_par' -- . user s param
The state defined there: STATE_SMTP_FINDHOST STATE_SMTP_CONNECTING STATE_SMTP_DIALOG STATE_SMTP_SENDING STATE_SMTP_DONE
sent -- number of bytes that already sent.



SRVInitSendMsgImidiatly To begin send message directly and immediate, to SMTP server of receptor use:
ServerStream SRVInitSendMsgImidiatly(char * from, int * to, MsgCallback callback=NULL, void * callback_param);
Parameters:
From -- sender e-mail
To -- Reception e-mail
callback -- callback function that will call for each change of state.
Return value:
If success return the pointer to Stream
NULL if error.


SRVInitSendMsgSMTP To begin send message through an external SMTP server use:
ServerStream SRVInitSendMsgSMTP(char * from, int * to, char * smtp_host, int port=25 , MsgCallback callback=NULL, void * callback_param=NULL);
Parameters:
From -- sender e-mail
To -- Reception e-mail
smtp_host -- the host of remote SMTP server to connect
port -- port of remote.
callback -- callback function that will call for each change of state.
Return value:
If success return the pointer to Stream
NULL if error.



SRVInitSendMsgBackgaund To begin send message directly but through background queue use:
ServerStream SRVInitSendMsgBackgaund(char * from, int * to, MsgCallback callback=NULL, void * callback_param=NULL);
Parameters:
From -- sender e-mail
To -- Reception e-mail
callback -- callback function that will call for each change of state.
Return value:
If success return the pointer to Stream
NULL if error.


SRVEndOfMsg After init sending you may put message date with SRVSend' or 'SRVprintf' and after it use 'SRVEndOfMsg to close the stream.
void SRVEndOfMsg(ServerStream * stream);
Parameters:
The stream -- pointer to stream that was transfer to callback function or return by SRVInitSendMsg*


SetSMTPServer The host program must only call SetSMTPServerServer function, that create SMTP server thread
int SetSMTPServer(SMTPReqCallback callback=NULL, int port=0, int mask=ALL_ACTIONS);
Parameters:
The callback -- callback function that will call for each request, after request received, before server do anything other
by default NULL -- int this case the server will just work with request.
The port -- TCP/IP port. If used default value zero, the server use value from config, by default 21.
mask -- the mask for action for that the server call callback
Return value:
Zero if success.
Subzero if fail



SetPOP3Server The host program must only call SetPOP3Server function, that create server thread
int SetPOP3Server(SMTPReqCallback callback=NULL, int port=0, int mask=ALL_ACTIONS);
Parameters:
The callback -- callback function that will call for each request, after request received, before server do anything other
by default NULL -- int this case the server will just work with request.
The port -- TCP/IP port. If used default value zero, the server use value from config, by default 21.
mask -- the mask for action for that the server call callback
Return value:
Zero if success.
Subzero if fail





SRVSend The host program may send data to the client with next functions:
int SRVSend(ServerStream * stream, void * bufer, int size);
Parameters:
The stream -- pointer to stream that was transfer to callback function.or return by SRVInitSendMsg*
The buffer -- buffer to send
The size -- size of buffer
Return value:
Number of bytes that has been send.
Zero if error

SRVprintf
int SRVprintf(ServerStream * stream, char * format, ...);
Parameters:
The stream -- pointer to stream that was transfer to callback function or return by SRVInitSendMsg*.
The format -- format like in stdio printf
... params by format
Return value:
Number of bytes that has been send.
Zero if error





SRVRecv If you would like reveive the data st you may use SRVRecv:
int SRVRecv(ServerStream * stream, void * bufer, int l);
Parameters:
The stream -- pointer to stream that was transfer to callback function.
The buffer -- buffer to receive
The size -- size of buffer
Return value:
Number of bytes that has been receive.
Zero if error


GetAUTHName To get info about POP3 authorization use next functions:
char * GetAUTHName(ServerStream * stream);
Parameters:
The stream -- pointer to stream that was transfer to callback function.
Return value:
pointer to user name.
GetAUTHPassw The NULL pointer if no control present.
char * GetAUTHPassw(ServerStream * stream);
Parameters:
The stream -- pointer to stream that was transfer to callback function.
Return value:
pointer to password.
The NULL pointer if no control present.



GetRemoteIP Advanced info about connection you may get with next functions.
ulong GetRemoteIP(ServerStream * stream);
Parameters:
The stream -- pointer to stream that was transfer to callback function.
Return value:
IP address of remote.

GetRemoteAddr
int GetRemoteAddr(ServerStream * stream, void * addr, int buflen);
Parameters:
The stream -- pointer to stream that was transfer to callback function.
Return value:
address of remote in sockaddr struct
GetSocket
int GetSocket(ServerStream * stream);
Parameters:
The stream -- pointer to stream that was transfer to callback function.
Return value:
socket




If you would like find MX records for domain use FindMX function:
struct MailHostInfo
{
char name[64]; The hostname of MX
int prior; MX priority
ulong ip[12]; Array of IP if it was present in reply.
FindMX };
int FindMX(char * domain, MailHostInfo * ret, int size);
Parameters:
domain -- the domain name
ret -- array of MailHostInfo where module will store data
size -- size of array
Return value:
number of MX that has been found If Ok
zero, if not found



The host program may load all params for module from separate file,
LoadConfig or my set required params directly, or use default values.
int LoadConfig(char * filename="ftp.cfg");
Parameters:
The filename -- name of configuration file.
Return value:
Zero if success.
Subzero if fail


SetConfigParam You may set all params directly:
void SetConfigParam(char * param, int val);
Parameters:
The param -- name of param
val -- value.
SetConfigParam
void SetConfigParam(char * param, char * val);
Parameters:
The param -- name of param
val -- value.

To get current values of configuration params you may use next functions:
GetConfigParamInt For integer params:
int GetConfigParamInt(char * param);
Parameters:
The param -- name of param

SetConfigParamStr For string params:
char *SetConfigParamStr(char * param);
Parameters:
The param -- name of param