How to send email with my CentOS server?

/bin/mail -s "Enter Subject Line here" -a /home/.../whateverFileYouWantAttached "you@YourEmailAddress" < /home/me/textBody.letter

try above command :)

Simple answer:

Set up sendmail. It will depend on your distribution but this isn't difficult at all. If you have any specific questions, ask away.

Complicated answer:

If you're asking this, you probably should not just jump the gun and setup sendmail justtt yet.

You'll need to take a few things into consideration:

1. Does your ISP allow you to send e-mail? You might be on non-server IP range and therefore, many e-mail providers will block your outright.

2. What address will you use as your from address? Are you authorized to send from this address (SPF, DomainKeys, etc)? If not, your messages might be detected as spam by e-mail providers---and rightfully so.

3. Last, but certainly not least: Do you really need to use your own SMTP service? Any reason why using your ISP's is not good enough?

Back in the days, setting up an SMTP server wasn't a big deal. Nowadays, the setup may be easier but setting it up so that it actually gets messages to people's mailboxes, is a challenge.

I can confirm that none of the above suggestions are working on my CentOS system at home either - not a single one. Which is annoying!

Then I tried the same on a fresh Amazon instance running CentOS 6.4, and even with the default configuration, I can send mail without problems. All I had to do was

yum install mailx

after which sending mail as described above works like a charm. Installing complications like sendmail are NOT necessary for what Jakub is trying to do.

It must be some configuration with my ISP, since I haven't got a configurable firewall at my end here.

You need to do the following:

1. sudo yum install postfix telnet mailx
2. sudo /etc/init.d/postfix start
3. sudo vi /etc/postfix/main.cf

4. Change mydestination = mydomain.com, localhost.mydomain.com, localhost

   to

   mydestination = localhost.mydomain.com, localhost

Test using the following from the command line

1. mail [email protected] Subject:
2. Test email from demoslice.com Test
3. body of the email.
4. .

No. 4 - there is just a full stop to complete the body of the email. You now should have mail.

The above will get you a working MTA (Mail Transfer Agent). Some resources which will help you with a more advanced setup can be found at slicehost's articles on email setup for CentOS (scroll down to the CentOS and Email section). You should really consider setting the following correctly: hostname, RDNS (Reverse DNS) and SPF (Sender Policy Framework) records with your DNS provider.

Have you modified your /etc/mail.rc to set the smtp address?

Try installing postfix & set the mydestination in configuration file even it should work with sendmail.

Postfix is on the right track, but unless gmail thinks you're at least remotely legit (e.g. You're not a spammer) getting your mail delivered is pretty unlikely.

The process is a bit involved to post here, but the simplest way I have found of achieving this (and having your mail delivered) is to set up postfix as a relay, using your own gmail account as a transport.

The process I use is detailed here:

http://rs20.mine.nu/w/2011/07/gmail-as-relay-host-in-postfix/

No setting up self signed certs are needed (as per sendmail) and in my experience, it just works!

The easy solution is not sendmail, but sendEmail:

http://caspian.dotconf.net/menu/Software/SendEmail/#download

A perl script that is easily configured to send via whatever SMTP server you can get to -- I use it to send through Gmail accounts all the time, but it also works for ordinary SMTP over TCP on port 25, etc.

I usually wrap the sendEmail perl script with my own shell script for Gmail:

#!/bin/bash

# Send gmail through an account specified in ~/.sendGmailAuthFile (or file identified with -k.)
# The auth file must have values for the -f (from@domain) and -xp (password) options of sendEmail,
# structured as:
#
#    [email protected]
#    pwd=xxxxxxx
#
# We will fill in the rest, and other params are passed through to sendEmail
#
# Example: sendGmail -u "My subject line" -t "[email protected]" < message.txt

function sendGmailImmed {
        local authFile="$HOME/.sendGmailAuthFile"
        for arg in "$@"; do
                if [[ "$arg" == "-k" ]]; then
                        shift
                        authFile="$1"
                        shift
                fi
        done
        initAuthFile $authFile
        source $authFile

        sendEmail -f $user -xu $user -xp $pwd -s smtp.gmail.com:587 -o tls=yes "$@"
}

function initAuthFile {
        # If the authfile doesn't exist, we'll create a dummy:
        if [[ ! -f $1 ]]; then
                echo "# sendGmail authentication file: " > $1
                echo "[email protected]" >> $1
                echo "pwd=my-password" >> $1
                echo "A shell auth file has been created as $1"
        fi
}

if [[ -z $sourceMe ]]; then
        sendGmailImmed "$@"
fi

If there is no smtp server install on localhost, you don't need to install one, just point to the one that you use as an smtp server to send mails.

yum install -y mailx
mail -S smtp={email_host} -s {subject} -r {email_from} {email_to}