Why does Email::MIME split up my attachment? - perl

Question

Why does the attachment(ca. 110KiB) split up in 10 parts(ca. 11KiB) when I send it with this script using Email::MIME?
#!/usr/bin/env perl
use warnings; use strict;
use Email::Sender::Transport::SMTP::TLS;
my $mailer = Email::Sender::Transport::SMTP::TLS->new(
host => 'smtp.my.host',
port => 587,
username => 'username',
password => 'password',
);
use Email::MIME::Creator;
use IO::All;
my #parts = (
Email::MIME->create(
attributes => {
content_type => 'text/plain',
disposition => 'inline',
encoding => 'quoted-printable',
charset => 'UTF-8',
},
body => "Hello there!\n\nHow are you?",
),
Email::MIME->create(
attributes => {
filename => "test.jpg",
content_type => "image/jpeg",
disposition => 'attachment',
encoding => "base64",
name => "test.jpg",
},
body => io( "test.jpg" )->all,
),
);
my $email = Email::MIME->create(
header => [ From => 'my#address', To => 'your#address', Subject => 'subject', ],
parts => [ #parts ],
);
eval {
$mailer->send( $email, {
from => 'my#address',
to => [ 'your#address' ],
} );
};
die "Error sending email: $#" if $#;

Answer 1

I had a similar case using MIME::Lite and Net::SMTP::TLS (using TLS rather than SSL because connection to smtp.gmail.com was not working with SSL) in my Perl script to send email with spreadsheet attachments through a gmail account, whereby the spreadsheet attachments were being broken up into multiple 10kb files.
Solution was to replace Net::SMTP::TLS with Net::SMTP::TLS::ButMaintained, which I hadn't initially seen. Newer TLS module works great.

Answer 2

I can offer you a workaround: using MIME::Lite instead