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=== My wiki won't send email ===
If your application already has email capability, but it won't send, then turn on the mail_log feature in php.ini and check that sendmail/postfix is installed on your system. You might start with <code>sudo apt-get install mailutils</code>. If on AWS or datacenter, you can set up as an internet site and be done. If you are behind a consumer broadband IP, you will probably need to setup a 'smarthosted' site and use (your own) IMAP credentials to send email through another provider.
=== I need a server to send email ===
You can setup [[Postfix]] to send as an Internet Site. And you can even use it to send mail through an external service like GMail (called 'smart hosting'). Once you do, you certainly need to add or reconfigure your domains <abbr title="Sender Policy Framework">SPF</abbr> record in DNS. If you just want to use the MX records and A records to control who is valid, then <code>"v=spf1 mx a -all"</code> is the record that works. This [http://www.spfwizard.net/ wizard] can help. Once you're done, you can check on things with
<code>nslookup -query=mx</code>
== Tools ==
# http://mxtoolbox.com/
== Issues ==
Users can be blocked for going over usage limits (messages per day, recipients per message, etc)
