#!/usr/bin/perl
use strict;
use warnings;
use Net::SMTPS;
use Authen::SASL;

my $user = 'postausgangFHEM@domain.de';
my $pass = 'KnAM';
my $sender = 'fhem@domain.de'; 
my $rcpt = 'marc@domain.de';
my $server = 'smtp.strato.de';
my $domain = 'www.strato.de';

my $mail_sasl_type = 'starttls';
my $server_port = 587;

my $smtp = Net::SMTPS->new( $server, Port => $server_port, Debug => 1, doSSL => $mail_sasl_type) || die "cannot connect to server ${server}";
my $sasl = Authen::SASL->new( mechanism => 'PLAIN', debug => 1, callback => {pass => $pass, user => $user}); 
$smtp->auth( $sasl ) || die "cannot do mail auth";
   
$smtp->mail($sender) or die "Error:".$smtp->message();
$smtp->to($rcpt) or die "Error:".$smtp->message();
$smtp->data() or die "Error:".$smtp->message();
$smtp->datasend("Subject: Mein Subject\n"); 
$smtp->datasend("\n");
$smtp->datasend("Mein Body");
$smtp->dataend() or die "Error:".$smtp->message();
$smtp->quit() or die "Error:".$smtp->message();

##</code><code>##

root@schneckenFhem:/opt/fhem# perl ./FHEM/sendEmail.pm
Net::SMTPS>>> Net::SMTPS(0.09)
Net::SMTPS>>>   IO::Socket::IP(0.39)
Net::SMTPS>>>     IO::Socket(1.39)
Net::SMTPS>>>       IO::Handle(1.39)
Net::SMTPS>>>         Exporter(5.73)
Net::SMTPS>>>   Net::SMTP(3.11)
Net::SMTPS>>>     Net::Cmd(3.11)
Net::SMTPS=GLOB(0x562fb253e128)<<< 220 smtp.strato.de ESMTP RZmta (P12 -)
Net::SMTPS=GLOB(0x562fb253e128)>>> EHLO localhost.localdomain
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-smtp.strato.de greets 89.244.230.217
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-ENHANCEDSTATUSCODES
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-PIPELINING
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-8BITMIME
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-DELIVERBY
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-SIZE 104857600
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-AUTH PLAIN LOGIN CRAM-MD5 DIGEST-MD5
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-STARTTLS
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-BURL imap
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-CHUNKING
Net::SMTPS=GLOB(0x562fb253e128)<<< 250 HELP
Net::SMTPS=GLOB(0x562fb253e128)>>> STARTTLS
Net::SMTPS=GLOB(0x562fb253e128)<<< 220 Ready to start TLS
Net::SMTPS=GLOB(0x562fb253e128)>>> EHLO localhost.localdomain
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-smtp.strato.de greets 89.244.230.217
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-ENHANCEDSTATUSCODES
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-PIPELINING
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-8BITMIME
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-DELIVERBY
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-SIZE 104857600
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-AUTH PLAIN LOGIN CRAM-MD5 DIGEST-MD5
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-REQUIRETLS
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-BURL imap
Net::SMTPS=GLOB(0x562fb253e128)<<< 250-CHUNKING
Net::SMTPS=GLOB(0x562fb253e128)<<< 250 HELP
cannot do mail auth at ./FHEM/sendEmail.pm line 20.