smtp - The IP you're using to send mail is not authorized to send email directly to our servers

Question

hi i wanted to send mail via smtp protocol to one of my gmail's accounts...

i tried but finally it occurred and error :

telnet> open alt4.gmail-smtp-in.l.google.com 25
Trying 74.125.131.27...
Connected to alt4.gmail-smtp-in.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP b4si2095585vdw.57 - gsmtp
HELO stackoverflow.com
250 mx.google.com at your service
MAIL FROM: <test@stackoverflow.com>
250 2.1.0 OK b4si2095585vdw.57 - gsmtp
RCPT TO: <■■■■@gmail.com> // filtered ;)
250 2.1.5 OK b4si2095585vdw.57 - gsmtp
DATA
354  Go ahead b4si2095585vdw.57 - gsmtp
test
ok
it done
.
550-5.7.1 [5.22.81.102] The IP you're using to send mail is not authorized to
550-5.7.1 send email directly to our servers. Please use the SMTP relay at your
550-5.7.1 service provider instead. Learn more at
550 5.7.1 http://support.google.com/mail/bin/answer.py?answer=10336 b4si2095585vdw.57 - gsmtp
Connection closed by foreign host.

so now how can i send mail without having this problem ?

Answer 1

This is because Google will reject any emails sent from IP in the spamhaus database.

For more information you can read here: http://productforums.google.com/forum/#!topic/gmail/Hus4RxoVTr0

What you need to do is go to http://www.spamhaus.org/lookup/ and follow the instruction there to remove your server ip from spamhaus database.