Provided by: libemail-sender-perl_1.300031-2_all bug

NAME

       Email::Sender::Manual::QuickStart - how to start using Email::Sender right now

VERSION

       version 1.300031

QUICK START

   Let's Send Some Mail!
       No messing around, let's just send some mail.

         use strict;
         use Email::Sender::Simple qw(sendmail);
         use Email::Simple;
         use Email::Simple::Creator;

         my $email = Email::Simple->create(
           header => [
             To      => '"Xavier Q. Ample" <x.ample@example.com>',
             From    => '"Bob Fishman" <orz@example.mil>',
             Subject => "don't forget to *enjoy the sauce*",
           ],
           body => "This message is short, but at least it's cheap.\n",
         );

         sendmail($email);

       That's it.  Your message goes out into the internet and tries to get delivered to
       "x.ample@example.com".

       In the example above, $email could be an Email::Simple object, a MIME::Entity, a string
       containing an email message, or one of several other types of input.  If "Email::Abstract"
       can understand a value, it can be passed to Email::Sender::Simple.  Email::Sender::Simple
       tries to make a good guess about how to send the message.  It will usually try to use the
       sendmail program on unix-like systems and to use SMTP on Windows.  You can specify a
       transport, if you need to, but normally that shouldn't be an issue.  (See "Picking a
       Transport", though, for more information.)

       Also note that we imported and used a "sendmail" routine in the example above.  This is
       exactly the same as saying:

         Email::Sender::Simple->send($email);

       ...but it's a lot easier to type.  You can use either one.

       envelope information

       We didn't have to tell Email::Sender::Simple where to send the message.  If you don't
       specify recipients, it will use all the email addresses it can find in the To and Cc
       headers by default.  It will use Email::Address::XS to parse those fields.  Similarly, if
       no sender is specified, it will use the first address found in the From header.

       In most email transmission systems, though, the headers are not by necessity tied to the
       addresses used as the sender and recipients.  For example, your message header might say
       "From: mailing-list@example.com" while your SMTP client says "MAIL
       FROM:<verp-1234@lists.example.com>".  This is a powerful feature, and is necessary for
       many email application.  Being able to set those distinctly is important, and
       Email::Sender::Simple lets you do this:

         sendmail($email, { to => [ $to_1, $to_2 ], from => $sender });

       in case of error

       When the message is sent successfully (at least on to its next hop), "sendmail" will
       return a true value -- specifically, an Email::Sender::Success object.  This object only
       rarely has much use.  What's more useful is what happens if the message can't be sent.

       If there is an error sending the message, an exception will be thrown.  It will be an
       object belonging to the class Email::Sender::Failure.  This object will have a "message"
       attribute describing the nature of the failure.  There are several specialized forms of
       failure, like Email::Sender::Failure::Multi, which is thrown when more than one error is
       encountered when trying to send.  You don't need to know about these to use
       Email::Sender::Simple, though.  All you need to know is that "sendmail" returns true on
       success and dies on failure.

       If you'd rather not have to catch exceptions for failure to send mail, you can use the
       "try_to_send" method, which can be imported as "try_to_sendmail".  This method will return
       just false on failure to send mail.

       For example:

         Email::Sender::Simple->try_to_send($email, { ... });

         use Email::Sender::Simple qw(try_to_sendmail);
         try_to_sendmail($email, { ... });

       Some Email::Sender transports can signal success if some, but not all, recipients could be
       reached.  Email::Sender::Simple does its best to ensure that this never happens.  When you
       are using Email::Sender::Simple, mail should either be sent or not.  Partial success
       should never occur.

   Picking a Transport
       passing in your own transport

       If Email::Sender::Simple doesn't pick the transport you want, or if you have more specific
       needs, you can specify a transport in several ways.  The simplest is to build a transport
       object and pass it in.  You can read more about transports elsewhere.  For now, we'll just
       assume that you need to send mail via SMTP on an unusual port.  You can send mail like
       this:

         my $transport = Email::Sender::Transport::SMTP->new({
           host => 'smtp.example.com',
           port => 2525,
         });

         sendmail($email, { transport => $transport });

       Now, instead of guessing at what transport to use, Email::Sender::Simple will use the one
       you provided.  This transport will have to be specified for each call to "sendmail", so
       you might want to look at other options, which follow.

       specifying transport in the environment

       If you have a program that makes several calls to Email::Sender::Simple, and you need to
       run this program using a different mailserver, you can set environment variables to change
       the default.  For example:

         $ export EMAIL_SENDER_TRANSPORT=SMTP
         $ export EMAIL_SENDER_TRANSPORT_host=smtp.example.com
         $ export EMAIL_SENDER_TRANSPORT_port=2525

         $ perl your-program

       It is important to note that if you have set the default transport by using the
       environment, no subsequent "transport" args to "sendmail" will be respected.  If you set
       the default transport via the environment, that's it.  Everything will use that transport.
       (Also, note that while we gave the host and port arguments above in lower case, the casing
       of arguments in the environment is flattened to support systems where environment
       variables are of a fixed case.  So, "EMAIL_SENDER_TRANSPORT_PORT" would also work.

       This is extremely valuable behavior, as it allows you to audit every message that would be
       sent by a program by running something like this:

         $ export EMAIL_SENDER_TRANSPORT=Maildir
         $ perl your-program

       In that example, any message sent via Email::Sender::Simple would be delivered to a
       maildir in the current directory.

       subclassing to change the default transport

       If you want to use a library that will behave like Email::Sender::Simple but with a
       different default transport, you can subclass Email::Sender::Simple and replace the
       "build_default_transport" method.

   Testing
       Email::Sender::Simple makes it very, very easy to test code that sends email.  The
       simplest way is to do something like this:

         use Test::More;
         BEGIN { $ENV{EMAIL_SENDER_TRANSPORT} = 'Test' }
         use YourCode;

         YourCode->run;

         my @deliveries = Email::Sender::Simple->default_transport->deliveries;

       Now you've got an array containing every delivery performed through Email::Sender::Simple,
       in order.  Because you set the transport via the environment, no other code will be able
       to force a different transport.

       When testing code that forks, Email::Sender::Transport::SQLite can be used to allow every
       child process to deliver to a single, easy to inspect destination database.

   Hey, where's my Bcc support?
       A common question is "Why doesn't Email::Sender::Simple automatically respect my Bcc
       header?"  This is often combined with, "Here is a patch to 'fix' it."  This is not a bug
       or oversight. Bcc is being ignored intentionally for now because simply adding the Bcc
       addresses to the message recipients would not produce the usually-desired behavior.

       For example, here is a set of headers:

         From: sender@example.com
         To:   to_rcpt@example.com
         Cc:   cc_rcpt@example.com
         Bcc:  the_boss@example.com

       In this case, we'd expect the message to be delivered to three people: to_rcpt, cc_rcpt,
       and the_boss.  This is why it's often suggested that the Bcc header should be a source for
       envelope recipients.  In fact, though, a message with a Bcc header should probably be
       delivered only to the Bcc recipients.  The "B" in Bcc means "blind."  The other recipients
       should not see who has been Bcc'd.  This means you want to send two messages:  one to
       to_rcpt and cc_rcpt, with no Bcc header present; and another to the_boss only, with the
       Bcc header.  If you just pick up Bcc addresses as recipients, everyone will see who was
       Bcc'd.

       Email::Sender::Simple promises to send messages atomically.  That is:  it won't deliver to
       only some of the recipients, and not to others.  That means it can't automatically detect
       the Bcc header and make two deliveries.  There would be a possibility for the second to
       fail after the first succeeded, which would break the promise of a pure failure or
       success.

       The other strategy for dealing with Bcc is to remove the Bcc header from the message and
       then inject the message with an envelope including the Bcc addresses.  The envelope
       information will not be visible to the final recipients, so this is safe.  Unfortunately,
       this requires modifying the message, and Email::Sender::Simple should not be altering the
       mutable email object passed to it.  There is no "clone" method on Email::Abstract, so it
       cannot just build a clone and modify that, either.  When such a method exists, Bcc
       handling may be possible.

       Example Bcc Handling

       If you want to support the Bcc header now, it is up to you to deal with how you want to
       munge the mail and inject the (possibly) munged copies into your outbound mailflow.  It is
       not reasonable to suggest that Email::Sender::Simple do this job.

       Example 1: Explicitly set the envelope recipients for Bcc recipients

       Create the email without a Bcc header, send it to the Bcc users explicitly and then send
       it to the To/Cc users implicitly.

         my $message = create_email_mime_msg;  # <- whatever you do to get the message

         $message->header_set('bcc');          # delete the Bcc header before sending
         sendmail($message, { to => $rcpt });  # send to explicit Bcc address
         sendmail($message);                   # and then send as normal

       Example 2: Explicitly set the envelope recipients for all recipients

       You can make a single call to "sendmail" by pulling all the recipient addresses from the
       headers yourself and specifying all the envelope recipients once.  Again, delete the Bcc
       header before the message is sent.

SEE ALSO

   This is awesome!  Where can I learn more?
       Have a look at Email::Sender::Manual, where all the manual's documents are listed.  You
       can also look at the documentation for Email::Sender::Simple and the various
       Email::Sender::Transport classes.

AUTHOR

       Ricardo Signes <rjbs@cpan.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2017 by Ricardo Signes.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.