mailx: "send-mail: illegal option -- a" while attempting to send file attachment - mailx

Our production server has been retired and now we are using a hosted system running Redhat GNU/Linux.
We had many scripts using mutt to send file attachments but they're failing now since mutt is not installed on our servers (The sysadmin policy is that mutt is not secure so it will not be installed)
I have tried using mailx but to no avail. When I do
echo "this is my email body"| mailx -s "this is my email subject" "email#xyz.com" -a "filename.csv"
I get
$ send-mail: illegal option -- a
"filename.csv" exist and it is local to the directory I run the command from. Of course, when I do
mailx -s "this is my email subject" "email#xyz.com" < "filename.csv"
It works but it embeds the file attachment in the email body. Users do not want that.
What am I doing wrong?

I figured it out. I simply moved the -a flag before the email address like so
echo "this is my email body"| mailx -s "this is my email subject" -a "filename.csv" "email#xyz.com"
It worked just fine.

uuencode filename.csv filename.csv | mailx -s "this is my email subject" "email#xyz.com"
Or, if you want to clump text and an attachment together, then
echo "this is my email body" | cat -<(echo uuencode filename.csv filename.csv) | mailx -s "this is my email subject" "email#xyz.com"

I came across the same problem, use -A instead of -a. It worked for me.

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Use mutt. Add list of files that you want to attach
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#!/bin/bash
echo Your Username?
read user
echo FIX Session?
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echo what client?
read client
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See Also
mailx manpage
how to send an email via mailx with enclosed file

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I'm trying to send an email in this way:
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This is running on a unix machine, the file has an html extenxion and contains html code.
I receive the file correctly, with the same filename and extension, the problem is that is completely empty, this is strange because when i run the same command (mutt) from the terminal, applying the same path to file:
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Is multiple attachment using mutt is possible?
The command
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Both of my files A and B are dynamically generated, so I cannot have an echo statement.
It's actually very simple:
mutt -s 'My mail ' abc#gmail.com -a report1.txt < report2.txt
If you had two scripts to create the reports, you could use pipes (i.e. no files would be created on disk):
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If the shell script prints file A's content to standard output, like this:
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then you can use tee to print both to the file A and into the pipe to mutt:
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