SYNOPSIS

       qmail-smtpam host [s]port

DESCRIPTION

       qmail-smtpam reads an email address from FD 3 and tries to verify this
       connecting to the remote host on port.  If port starts is s ´implicit
       TLS´ ist used on that port.  In a standard SMTP dialog, qmail-smtpam
       supplies the HELO greeting, a MAIL FROM: <> address, and the purported
       RCPT TO: <address>.

       qmail-smtpam exits '0' if the remote server replies with '250',
       otherwise '1'.  In case the control files can not be read or a
       communication problem has occured, it exits '111'.

CONTROL FILES

       domainips
            IP addresses to be used on outgoing connections.  Each line has
            the form domain:localip(%ifname)|helohost, without any extra
            spaces.  If domain matches the domain part in sender, qmail-smtpam
            will bind to localip when connecting to host.  LLU IPv6 addresses
            need to be appended with the binding ifname following localip with
            a '%'.  If it matches, it will set the provided HELO string as
            greeting; otherwise, it will use the default.

       helohost
            Current host name, for use solely in saying hello to the remote
            SMTP server.  Default: me, if that is supplied; otherwise
            qmail-smtpam refuses to run.

       timeoutconnect
            Number of seconds qmail-smtpam will wait for the remote SMTP
            server to accept a connection.  Default: 60.  The kernel normally
            imposes a 75-second upper limit.

       timeoutremote
            Number of seconds qmail-smtpam will wait for each response from
            the remote SMTP server.  Default: 1200.

       tlsdestinations
            If present, this file advices qmail-smtpam to use TLS encryption
            for specific destination domains as provided by the forward-path
            and perhaps to validate/verify the domain's server certificate:
            destination:cafile|verifydepth;[s]port|ciphers|domain.  If port is
            give as or prepended with s ´implict TLS´ is used; omitting
            StartTLS.  Unless explicitely configured, qmail-smtpam accepts any
            or no certificate provided by the server, thus uses TLS for
            encryption only.  qmail-smtpam uses the same certificate
            validation/verification mechanism as qmail-remote except for
            distinguishing among the sender's domain information.