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I am installing my easy to install floating cloud email server in AWS Marketplace:
I am in the Final test stages. I have implimented only a small amoiunt of spam protection, however this is enough to block the biggest spammer in the multiverse. The blocked ip address is owned my google and used to send email: nslookup 209.85.222.182
182.222.85.209.in-addr.arpa name = mail-qk1-f182.google.com.
I have installed this on AWS EC2 and requested that AWS lift smtp restrictions. I also use AWS SES. Neither is llisted by sorbs.