Hi, If I understand RFC3461 correctly the ENVID is just appended to the From-addres, their example is: 
<<< 220 Example.ORG SMTP server here
>>> EHLO Example.ORG
<<< 250-Example.ORG
<<< 250-DSN
<<< 250-EXPN
<<< 250 SIZE
>>> MAIL FROM:<Alice@Example.ORG> RET=HDRS ENVID=QQ314159
<<< 250 <Alice@Example.ORG> sender ok
>>> RCPT TO:<Bob@Example.COM> NOTIFY=SUCCESS \
    ORCPT=rfc822;Bob@Example.COM
<<< 250 <Bob@Example.COM> recipient ok
>>> RCPT TO:<Carol@Ivory.EDU> NOTIFY=FAILURE \
    ORCPT=rfc822;Carol@Ivory.EDU

[download]
so something like: 
use Net::SMTP;
 
my $smtp = Net::SMTP->new('mail.example.org');
$smtp->ehlo();
$smtp->mail('<Alice@Example.ORG> RET=HDRS ENVID=QQ314159');
$smtp->to('RCPT TO:<Bob@Example.COM> NOTIFY=SUCCESS ORCPT=rfc822;Bob@E
+xample.COM
');
 
$smtp->data();
$smtp->datasend('To: Alice@Example.ORG');
$smtp->datasend('Subject: test');
$smtp->data(); 
$smtp->datasend($your_message_here);

$smtp->dataend();
 
$smtp->quit();

[download]
should do the trick. I haven't got a mailserver that supports the ENVID extension, so didn't test this.

In reply to Re: Sending mail: setting envelope id by eXile
in thread Sending mail: setting envelope id by hv

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.