Zenovation's Blog » mail

Sending Mail From Bash Scripts with an Attachment

Michael — Tue, 27 Apr 2010 14:06:02 +0000

Here is a great little tut on getting started in Bash. I’d recommend it to anyone trying to hack their way into a shell script.

Here is a quick script for sending an email:

^?View Code BASH

#!/bin/bash
 
# Subject of email
SUBJECT="Test email with attachment from a bash script"
 
# Where to send it
TO_ADDRESS="your@email.com"
 
# Where the attachment is
ATTACHMENT_FILE="/tmp/attachment.txt"
 
# For fun, let's put something into the attachment
echo "This goes into the file."  >  $ATTACHMENT_FILE
echo "This appends to the file." >> $ATTACHMENT_FILE
 
# send the message
/bin/mail -s "$SUBJECT" "$TO_ADDRESS" < $ATTACHMENT_FILE

Changing SMTP Port to 587 (ISP Blocking and SASL)

Michael — Tue, 31 Mar 2009 07:27:59 +0000

I got tired of ISPs blocking outgoing port 25, so I moved our SMTP for clients to port 587. Unfortunately, when migrating our new server, I couldn’t remember how to do this.

After some Googling, I found the answer; add this line in /etc/postfix/master.cf, substituting your port number for 25000:

^?View Code BASH

25000 inet n - n - - smtpd -o smtpd_sasl_auth_enable=yes

I left port 25 on too, so users can try either from their ISP. If you want to turn off port 25, just comment out this line:

^?View Code BASH

smtp    inet    n       -       n       -       -       smtpd -o smtpd_sasl_auth_enable=yes

Remember to open up the port in your server firewall as well!