How can I debug this? It happens when BackupPC_nightly tries to send e-mail at 
1:00 am.

The only place I have "John" is in config.pl in: $Conf{RsyncdUserName} = 
'John';  but this is the rsyncd authentication user name, and it's not supposed 
to interfere with BackupPC_sendEmail?

Note: in BackupPC_sendEmail, I have added "-t" in sub SendMail at line 387, 
namely:
 if ( !open(MAIL, "|$Conf{SendmailPath} -t $from") ) {
    
        printf("Can't run sendmail ($Conf{SendmailPath}): $!\n");
return;    
}

"-t" makes msmtp pick up the destination address from the e-mail headers.

Note that this works fine: / # msmtp -d -t < /mnt/HD_a2/Temp/mailfile
Where mailfile is: 
To: user_to AT domain1 DOT com
From: user_from AT domain2 DOT com
Subject: Mail test
This is a message
EOF

msmtp sends the e-mail to "user_to AT domain1 DOT com", which it picked up from 
the "To:" header.

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