apt-get install sendmail

Sendmail, unlike postfix, won’t work out of the box. Postfix will prompt you for the necessary config setup when running the install. Sendmail won’t, and therefore it’s not ‘out of the box’. You’ll have to make some modifications on your own. Nothing major but this is what I’ve found in order to get it to work, reliably and quickly. The first thing I did was add the fully qualified domain name to my /etc/hosts file

#vim /etc/hosts
127.0.0.1 www.mydomain.com

After this I added the fully qualified domain name to my apache default configuration file

#/etc/apache2/sites-available/default
ServerName www.mydomain.com
#vhost info etc...

Reload and restart…

/etc/init.d/apache2 force-reload
/etc/init.d/sendmail restart

You can test sendmail like so

sendmail email@example.com
hello
from
me
. 

This should deliver a message to you (the “.” on a new line, followed by a new line, closes the message).

Related posts:

1. Send Mail in Ruby with a Pony
2. Rails, SSL, Ubuntu, Apache2 with Phusion on Ubuntu
3. Postfix, ActionMailer and OpenSSL Fix on Ubuntu

  vim /etc/postfix/main.cf

Change

 smtpd_use_tls=yes

to

smtpd_use_tls=no

OpenSSL support with Postfix does not work out of the box. You can either generate valid certificates or tell Postfix not to use the certificates. More information is available in this discussion forum.

http://forum.slicehost.com/comments.php?DiscussionID=2656

Related posts:

1. Rails, SSL, Ubuntu, Apache2 with Phusion on Ubuntu
2. OpenSSL Certificate Generation Information for Certificate Authority to Serve Traffic Over Https
3. Using sendmail to send mail on ubuntu box

production:
  adapter: mysql
  encoding: utf8
  reconnect: false
  database: db_production
  pool: 5
  username: db_user
  password: db_password
  #socket: /tmp/mysql.sock #this may vary

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2. Dump MySQL Database without Drop Table Syntax
3. Setting up a new ubuntu server with apache2, php, ruby on rails, rubygems, mysql, and git