Hi,

when I send email to my server, simetimes I don't get it, and this comes out:

Transcript of session follows.

Out: 220 mail.my-server.com ESMTP Postfix
In: EHLO an-out-0708.google.com
Out: 250-mail.my-server.com
Out: 250-PIPELINING
Out: 250-SIZE 20480000
Out: 250-VRFY
Out: 250-ETRN
Out: 250-AUTH CRAM-MD5 DIGEST-MD5 LOGIN PLAIN
Out: 250-AUTH=CRAM-MD5 DIGEST-MD5 LOGIN PLAIN
Out: 250-ENHANCEDSTATUSCODES
Out: 250-8BITMIME
Out: 250 DSN
In: MAIL FROM:<my-email@gmail.com>
Out: 250 2.1.0 Ok
In: RCPT TO:<target@my-server.com>
Out: 451 4.3.0 <target@my-server.com>: Temporary lookup failure
In: QUIT
Out: 221 2.0.0 Bye


The email is lost. What to do, what is wrong?