08-29-2016
Bad News here
It's common practice to block mail servers from private internet connections with dynamically assigned IP addresses. You'll have a lot of rejections for valid mails. Nothing you can do about it. Fighting Spam means making it hard for spammers to send emails - at the same time making it hard for everybody to send emails.
And don't even try to send mails without a proper set up mail server(rdns, SMTP-Banner, Relay-Restriction,...). Connection will be dropped, faster than your mailer can say HELO.
IMO is using a smarthost one of the easier alternatives here.
Last edited by stomp; 08-29-2016 at 05:32 PM..
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smtp(n) smtp client smtp(n)
NAME
smtp - Client-side tcl implementation of the smtp protocol
SYNOPSIS
package require Tcl
package require mime ?1.3.2?
package require smtp ?1.3.2?
::smtp::sendmessage token option...
DESCRIPTION
The smtp library package provides the client side of the smtp protocol.
::smtp::sendmessage token option...
This command sends the MIME part (see package mime) represented by token to an SMTP server. options is a list of options and their
associated values. The recognized options are:
-servers
A list of SMTP servers. The default is localhost.
-ports A list of SMTP ports. The default is 25.
-queue Indicates that the SMTP server should be asked to queue the message for later processing. A boolean value.
-atleastone
Indicates that the SMTP server must find at least one recipient acceptable for the message to be sent. A boolean value.
-originator
A string containing an 822-style address specification. If present the header isn't examined for an originator address.
-recipients
A string containing one or more 822-style address specifications. If present the header isn't examined for recipient
addresses). If the string contains more than one address they will be separated by commas.
-header
A list of keywords and their values (may occur zero or more times).
If the -originator option is not present, the originator address is taken from From (or Resent-From); similarly, if the -recipients option
is not present, recipient addresses are taken from To, cc, and Bcc (or Resent-To, and so on). Note that the header key/values supplied by
the -header option (not those present in the MIME part) are consulted. Regardless, header key/values are added to the outgoing message as
necessary to ensure that a valid 822-style message is sent.
The command returns a list indicating which recipients were unacceptable to the SMTP server. Each element of the list is another list, con-
taining the address, an SMTP error code, and a textual diagnostic. Depending on the -atleastone option and the intended recipients, a non-
empty list may still indicate that the message was accepted by the server.
SEE ALSO
mime, pop3, ftp, http
KEYWORDS
mail, mail, email, smtp, mime, rfc821, rfc822, internet, net
mime 1.3.2 smtp(n)