Dear google engineering,
We are from a business in Greece, currently we are having a problem when sending mail from domain intelsolutions.gr
to google mail services with the following error content:
>: host gmail-smtp-in.l.google.com
said: 550-5.7.28 [22.214.171.124 1] Our system has detected an
unusual rate of 550-5.7.28 unsolicited mail originating from your IP
address. To protect our 550-5.7.28 users from spam, mail sent from your IP
address has been blocked. 550-5.7.28 Please visit 550-5.7.28
to review our 550
5.7.28 Bulk Email Senders Guidelines.
y20-20020a056402271400b00461e870df81si8890131edd.620 - gsmtp (in reply to
end of DATA command)"
On October 21, 2022, our mail service system was spammed, so organizations blocked the IP mail server, in the time of October 22, 2022 we have fixed all spam related issues but until Currently, it is still not possible to send mail outside of google mail service, thanks to google technical help we can remove IP mail server 126.96.36.199 from the blacklist to serve our business.