public void setMailFrom(String mailFrom) {
        this.mailFrom = mailFrom;
    }
<p>
This action specifies whether to preserve or replace original mail from address while relaying received emails to
a destination server.
</p>

@param mailFrom
       This action specifies whether to preserve or replace original mail from address while relaying received
       emails to a destination server.
@see MailFrom
aws-java-sdk-mailmanager/src/main/java/com/amazonaws/services/mailmanager/model/RelayAction.java