Not getting emails sent with JavaMailSender with amazon EC2 to google mail (aliases)

Hello!
Never did web, but then I had to work. The problem is following — I have the dev (ubuntu) on amazon EC2 (yet without the domain name), there's a website (java + JSP), the apache server that proxies all tomcat'have mail server Postfix. Java send mail successfully sent and reaches the addressee, but to a specific address (an alias) the email is not coming. Not even to a particular address and for every alias with a specific domain name. The people (which mail does not reach) have mail on google, just with a domain name (more details can not describe. because you do not understand this, but I think webmasters will understand what I mean).
I think code is not needed, but just in case — send mail like this:

 MimeMessagePreparator preparator = new MimeMessagePreparator() {
@Override
 public void prepare(MimeMessage mimeMessage) throws Exception {
 MimeMessageHelper message = new MimeMessageHelper(mimeMessage,true,"UTF-8");
message.setFrom(emailFrom);
message.setTo(emailManager);
message.setSubject(emailToManagerSubject);

 Map<string,object> model = new HashMap<string, object>();
 // fill model

 String text = VelocityEngineUtils.mergeTemplateIntoString(
velocityEngine,
"email_tpl.vm",
"utf-8",
model
);
 message.setText(text, true);
}
};

try
{
this.mailSender.send(preparator);
}
 catch (MailException ex)
{
 logger.error("some text");
}
}
</string></string,object>

where mailSender and velocityEngine declared here

@Autowired
 JavaMailSender mailSender;

@Autowired
 VelocityEngine velocityEngine;

Yes, even — to any other email address (not an alias) with the same domain name letter reach, the problem is with aliases. On the alias with a different domain name (tried to create a so-called "group" in your gmail account) also reach. In Postfix'and logs (/var/log/mail.log) everything is OK, mail is sent without error but the receiver argues that there are no letters.

I don't know where to dig, maybe somebody have any ideas?

update
When sending with sendmail emails reach.