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(Perl) Send Email without Mail ServerHow to send an email without a mail server (so-to-speak).
use chilkat(); # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. # Is it really possible to send email without connecting to # a mail server? Not really. # When people ask 'Do you support sending email without # a mail server'? what they're really asking is: 'I don't # have an SMTP server, and I want to send email. I see # other components available where it's not necessary # to specify an SMTP server. Does your component have that # ability?' In short, the answer is Yes. But you need # to understand some things before you jump in... # Here's what happens inside those other components # that claim to not need a mail server: The component does # a DNS MX lookup using the intended recipient's email address # to find the mail server (i.e. SMTP server) for that # domain. It then connects to that server and delivers the # email. You're still connecting to an SMTP server -- just # not YOUR server. # Chilkat provides an MxLookup method where you can lookup # the SMTP hostname that services any given email address. # You would then assign the SmtpHost property to this value. # Chilkat can then connect directly to the recipient's mail # server and deliver the email. # There are a few gotcha's though... # First, if you're writing an application that is widely # distributed, your app might be running within a network # that blocks outgoing connections to the SMTP port. # Earthlink, for example, is one major ISP that does this. # When you are connected to the Internet via Earthlink, # your apps can *only* connect to Earthlink's SMTP server # and will not be able to reach any remote servers. To send # email, you must use Earthlink's SMTP as a relay. This is # common with ISPs. So... if your application is coded # as in this example, it will not work within those networks. # # Second, some SMTP servers will reject unauthenticated # sessions attempting to send email from dynamic IP addresses. # You may see this error in your LastErrorText: # 553-Your attempt to send email to us has been blocked # 553-because your email server is not currently on that domain's Accepted # 553-Senders list. To request addition to their Accepted Senders list, # 553-please navigate with a Web browser to the following URL: # 553-http://reportrbl.gate2service.com/Whitelist/?IPAddress=67.173.123.150 # 553 See http://www.dnsbl.us.sorbs.net/ (dul) # In a nutshell, just because you were able to do the MxLookup # and connect to the recipient's mail server, doesn't mean # you'll be able to send email -- it depends on the IP address # from which you're connecting. # Finally, the DNS lookup is potentially time consuming. # In addition, you cannot use somebody else's email server # as a relay, so if you're connecting to smtp.xyz.com, you # can only send email to email addresses at xyz.com. # To send email to 3 recipients at different domains means # making 3 separate connections to 3 separate SMTP servers # to send the email one at a time. # The mailman object is used for sending and receiving email. $mailman = chilkat::CkMailMan->new(); $recipient = 'admin@chilkatsoft.com'; # Do a DNS MX lookup for the recipient's mail server. $smtpHostname = $mailman->mxLookup($recipient); if ($mailman->get_LastMethodSuccess() != 1) { print $mailman->lastErrorText() . "\r\n"; exit; } print $smtpHostname . "\r\n"; # Set the SMTP server. $mailman->put_SmtpHost($smtpHostname); # Create a new email object $email = chilkat::CkEmail->new(); $email->put_Subject("This is a test"); $email->put_Body("This is a test"); $email->put_From('My Name <myname@mydomain.com>'); $email->AddTo("",$recipient); $success = $mailman->SendEmail($email); if ($success != 1) { print $mailman->lastErrorText() . "\r\n"; } else { print "Mail Sent!" . "\r\n"; } |
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