Email handling

In order to have incoming email in our app we set up Exim4 for multiple virtual domains. (Thanks to @dracos to set us in the right path)

We set up exim4 according to guide

Exim4 configuration

Install exim4 package

apt-get install exim4-daemon-heavy

Configure the exim package

sudo dpkg-reconfigure exim4-config

This is what we answered

1. internet site; mail is sent and received directly sing SMTP

2. System mail name > writeit.ciudadanointeligente.org

3. IP-addresses to listen on for incoming SMTP connections > Empty

4. Other destinations for which mail is accepted > writeit.ciudadanointeligente.org

5. Domains to relay mail for > writeit.ciudadanointeligente.org; *.writeit.ciudadanointeligente.org

6. Machines to relay mail for > Empty

7. Keep number of DNS-queries minimal (Dial-on Demand)? > No

8. Delivery method for local mail > mbox

9. Split configuration into small files? > Yes

10. Directory for root and postmaster mail > Empty

We create a directory called virtual in /etc/exim4

mkdir /etc/exim4/virtual

Create a file with the name of the domain in our case this will be writeit.ciudadanointeligente.org

vim /etc/exim4/virtual/writeit.ciudadanointeligente.org

With the content

* : ubuntu@localhost
local_part_suffix = +* : -*
local_part_suffix_optional

We modified the file /etc/exim4/conf.d/main/01_exim4-config_listmacrosdefs where we replaced domainlist with domainlist local_domains = @:localhost:dsearch;/etc/exim4/virtual

We created the file /etc/exim4/conf.d/router/350_exim4-config_vdom_aliases with the content:

vdom_aliases:
      driver = redirect
      allow_defer
      allow_fail
      domains = dsearch;/etc/exim4/virtual
      data = ${expand:${lookup{$local_part}lsearch*@{/etc/exim4/virtual/$domain}}}
      retry_use_local_part
      pipe_transport   = address_pipe
      file_transport   = address_file
      no_more

Then restarted:

sudo service exim4 restart

Then we created at /home/ubuntu a file called .forward with the content |/home/ubuntu/handleemail.py

Then we added two mx records with the value writeit and name ciudadanointeligente.org and priority 1 and the other one with value writeit but name writeit.ciudadanointeligente.org and priority 5.

Then because we are using amazon AWS we had to open the ports 25 and 465 in the security group for the instance which is running exim.

Then we changed the permissions in the file .forward to 644 and we added execution permissions to the handleemail.py:

` chmod 644 .forward

chmod +x handleemail.py `