On every application server a local MTA is running and listening on localhost port 25. You can use it to send mails.
The advantage of using the local MTA is that mails are queued if they can't get delivered directly.
To get better message delivery you should configure a SPF Record Show archive.org snapshot for all domains you use for sending mails.
If you already have a SPF record, please add
include:_spf.makandra.de to it. If you are not having a SPF record, please ask your email provider how to set it up. If you are not sure about what to do, you can also write us an email to email@example.com.
For example if you also use google apps with this domain you have to configure
v=spf1 include:_spf.makandra.de include:_spf.google.com -all