This blog contains experience gained over the years of implementing (and de-implementing) large scale IT applications/software.

HowTo: Script eMail With Attachment Direct via SMTP Server

Have you ever wondered how you can directly send an email with a file attachment, direct from a shell script via an SMTP server?
That is, without needing to rely on any mail or sendmail setup on the UNIX/Linux server.
Well, it’s simple.

Create a script that encodes the file you wish to attach, into BASE64, then type the following to send the file:

telnet 25<<EOF
mail from:
rcpt to:
Subject: Test attachment

Mime-Version: 1.0
Content-Type: multipart/mixed; boundary=attachmentbound

The email body

Content-Type: application/octet-stream; name="attachmentfile"
Content-Disposition: attachment; filename="thefilename.txt"
Content-Transfer-Encoding: base64

VGVzdCBBdHRhY2htZW50     <<-- Insert your BASE64 content here!


You need to have the content already encoded in BASE64.
For this you could use a Perl script using the MIME::Base64 module as shown below:

use MIME::Base64;
#printf ("%s", encode_base64(eval ""$ARGV[0]""));

## Check to see if each and every file exists ##
foreach $file (@ARGV)
if (not -e $file)
print "File "$file" does not existn";
exit( 1 );

# Convert file to BASE64
open( OUTFILE, ">$file.out") or die "Could not open outputfile: $!n";;
open( FILE, $file ) or die "Could not open inputfile: $!n";
local($/) = undef;
print OUTFILE encode_base64(<FILE>);
close( FILE );
close( OUTFILE );

SAP Sender Address for Communication Method

Whilst configuring SAP to send email oubound via SMTP you have to configure the node in SCOT to point to an SMTP server.
Once this is done, you would expect it to just work.
Unfortunatly, you may get the following issue.

When you create a new email message in SO01, you enter the recpient and the message text, then click send, and you are prompted with an error:

The error in the log book says:

You do not have a sender address in the chosen communication method.

This was an odd error, but a quick search on SAP notes revealed note 552616.

The note mentioned either setting my user’s external email address in SU3 (or SU01), or alternatively, instead of doing this for all users that wish to send external mail, you can set the “default domain” in SCOT.

Set the default domain to something like “”.
This means SAP will create an outbound sender address comprised of the SAP username plus the default domain (

I was then able to send mail externally.