Mail not work

I created email account and test send mail to gmail
But not work
Please help me
Thanks

I have exactly the same problem! My email is not receiving anything!

Check if your domain and the IP and in this blacklist.

check your mailserver logs and don't forget to check that also with your hosting provider,
 since they will need to assist you with rDNS/PTR setup.

Hello,

I can't receive emails too.
The test from network-tools.com shows as follow:

[Contacting xxx.com [46.10.xxx.34]...]
[Connected]
220 xxx.com ESMTP Postfix
EHLO test.network-tools.com
250-xxx.com
250-PIPELINING
250-SIZE 204800000
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
VRFY admin
402 4.5.1 VRFY command is disabled
RSET
250 2.0.0 Ok
EXPN admin
402 4.5.2 Error: command not recognized
RSET
250 2.0.0 Ok
MAIL FROM:<admin@Network-Tools.com>
250 2.1.0 Ok
RCPT TO:<admin@xxx.com>
451 4.3.5 Server configuration problem
[Unfavorable reply code, cannot continue]
RSET
250 2.0.0 Ok
QUIT
221 2.0.0 Bye
[Connection closed]

Also my DNS records is correct and I have a PTR record too:

# dig xxx.com mx +short
0 xxx.com.
# dig kvartirata.com a +short
46.10.xxx.34
# dig -x 46.10.xxx.34 +short
xxx.com.

mydomain = xxx.com
myhostname = xxx.com

Before my hostname was hsrv.xxx.com, but the mail server still cannot receive any mails.