SMTPCONF parameter* ==  SMTPCONF=what:conf
                    --  default: SMTPCONF=bgdatasize:64K

myname:name

Specify the name of this host to be shown to client or server in its opening message, HELO command, and so on.

reject:{nohelo,nofrom,pipeline,nomx,notselfmx,notmxhelo}

Reject the DATA or the session if a specified condition is true.

"nohelo" -- the client does not say "HELO"

"nofrom" -- the client does not say "MAIL FROM"

"pipeline" -- the client send command without waiting server's response

"nomx" -- the client's host does not have a MX record

"notselfmx" -- the client's host is not the MX of itself

"notmxhelo" -- the domain in the HELO is not the MX of the client's host

Multiple conditions can be specified concatenated with "+" as SMTPCONF="reject:nomx+nohelo+nofrom+pipeline".

bgdatasize:N

If the data is larger than N bytes, relay it in background. This means relaying a "DATA" command to a server without having a client wait for the response for "QUIT" command from the server. Note that only one mail DATA can be relayed in background and the mail can be lost if the DeleGate crashes before finishing the forwarding because the current DeleGate have no mechanism for spooling and retransmission.

maxrcpt:N

Limit the acceptable maximum number of recipients (by RCPT commands)

MX:server[:domain]

Specify the SMTP server toward which mails (bound for the domain) are forwarded. The server can be specified based on the destination address of the E-mail to be relayed (it is the address indicated in the RCPT command on the SMTP protocol). The character "*" in server is replaced with the domain part of a E-mail address as "foo@domain". The prefix "-MX." to a domain name as "-MX.domain" represents the mail-exchange server of the domain (which is retrieved by DNS as the MX record of the domain or host).
The default specification is SMTPCONF="MX:{-MX.*,*}" which means trying the MX first, and if it failed, then try direct connection to the domain as a hostname.

Examples:
SMTPCONF="MX:smtpserver" -- use the smtpserver as the upstream SMTP server
SMTPCONF="MX:{smtpserver1,smtpserver2}" -- try the SMTP servers in the order
SMTPCONF="MX:{-MX.*,*}" -- the default configuration
SMTPCONF="MX:{-MX.*,*,smtpserver}" -- adding a backup SMTP server
SMTPCONF="MX:{*,-MX.*}:*.localdomain" -- forward directly to the host if it's in localdomain
SMTPCONF="MX:smtpserver:{*.dom1,*dom2}" -- a server for the specified domains


callback[:[T][:srcHostList]]

Callback to the SMTP server on the client host which is making current request (on HELO command). If there is not a SMTP server on the client host, then the processing of the request will be delayed up to T seconds. This could be effective to reduce DDoS type SPAM messages which are relayed exploiting non-SMTP servers. SMTPCONF="callback" is the abbreviation of SMTPCONF="callback:20:*".

bcc:emailAddr[:srcHostList]

Append the emailAddr to the list of recipients.