In several modules of Eventure (when you send an email) it's possible to change the "FROM:" address to your own e-mail address, so it looks like the email is sent by your own mailserver.
However, more and more organizations are choosing to build in a security step for this, because sending email on behalf of another domain can also be used by
SPF stands for Sender Policy Framework.
In an SPF record you can describe which servers may send e-mail on behalf
of the domain name. A receiving server can decide on the basis of the SPF
record, to let an email pass, to mark it as unsafe or to reject it.