I see you're having troubles with spam, it happens. I'm receiving this message when a mail is sent from my Zoho to my Gmail (x-out stuff to protect me, added info in
red):
Technical details of the failure:
4.7.0 [74.201.154.111 15] Our system has detected an unusual rate of
4.7.0 unsolicited mail originating from your IP address. To protect our
4.7.0 users from spam, mail sent from your IP address has been temporarily
4.7.0 rate limited. Please visit
4.7.0 review our Bulk Email Senders Guidelines. xxxx.114 - gsmtp
----- Transcript of session follows -----
Received:from xxx-pao.sendlabs.com (xxx-pao.sendlabs.com [216.146.xx.xx]) by mx.zohomail.com
with SMTPS id xxx; Tue, 13 Sep 2016 09:32:59 -0700 (PDT)
Date:Tue, 13 Sep 2016 16:32:00 +0000
Subject:xxx
Content-Type:multipart/alternative;
boundary="--==_mimepart_xxx";
charset=UTF-8
P.S: Please note that your email forwarding will be disabled if there are too many failures.