<p dir="ltr">Google can be tricky to get an unblock from. Usually I find that if you fill out the form here carefully and explain it they will usually unblock. However they can be pretty tough to convince if you have a large number of spam reports from Google users. Sometimes you have to change IPs.<br>
<a href="https://support.google.com/mail/contact/msgdelivery">https://support.google.com/mail/contact/msgdelivery</a><br>
</p>
<div class="gmail_quote">On Jul 11, 2013 3:15 PM, "L. V. Lammert" <<a href="mailto:lvl@omnitec.net">lvl@omnitec.net</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On -1 xxx -1, it was written:<br>
<br>
> Without the bounce message it is hard to tell..but you should have<br>
> Domainkeys and SPF setup if you want good odds of being able to send to<br>
> Google. You should also ensure the server is not on an IP block that is<br>
> marked for client usage.<br>
><br>
The error returned has not changed for over a month:<br>
<br>
<br>
SMTP error from remote mail server after end of data:<br>
host <a href="http://gmail-smtp-in.l.google.com" target="_blank">gmail-smtp-in.l.google.com</a> [74.125.129.27]:<br>
550-5.7.1 [198.46.86.21] Our system has detected an<br>
unusual rateof<br>
550-5.7.1 unsolicited mail originating from your IP address. To<br>
protect our<br>
550-5.7.1 users from spam, mail sent from your IP address has been<br>
blocked.<br>
550-5.7.1 Please visit <a href="http://www.google.com/mail/help/bulk_mail.html" target="_blank">http://www.google.com/mail/help/bulk_mail.html</a><br>
to review<br>
550 5.7.1 our Bulk Email Senders Guidelines. zk10si13903920pac.185 -<br>
gsmtp<br>
<br>
spf appears valid, .. no blacklists or entries on senderbase.<br>
<br>
Lee<br>
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</blockquote></div>