Hi, please how can i setup SMTP server whose emails wont be rejected by AOL, Gmail, Yahoo etc?

People say its imporatant to have reverse DNS


  • AOL does require that all connecting Mail Transfer Agents have established reverse DNS, regardless of whether it matches the domain.
  • Reverse DNS must be in the form of a fully-qualified domain name. Reverse DNS containing in-addr.arpa are not acceptable, as these are merely placeholders for a valid PTR record. Reverse DNS consisting of IP addresses are also not acceptable, as they do not correctly establish the relationship between domain and IP address.


[[email protected] home]# dig -x 37.11.11.11


; <<>> DiG 9.3.6-P1-RedHat-9.3.6-20.P1.el5_8.6 <<>> -x 37.59.228.66
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 28206
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0


;; QUESTION SECTION:
;66.11.11.11.in-addr.arpa. IN PTR


;; AUTHORITY SECTION:
11.11.11.in-addr.arpa. 67 IN SOA dns100.ovh.net. tech.ovh.net. 2013083000 43200 4320 2419200 86400


;; Query time: 10 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Sep 10 05:59:05 2013
;; MSG SIZE rcvd: 98
[[email protected] home]# telnet 37.11.11.11 25
Trying 37.11.11.11...
Connected to 37.11.1.11.
Escape character is '^]'.
220 mydomain.tk - Welcome to Qmail ESMTP


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Something for reading

Why is email from my server marked as Spam?
http://www.serverintellect.com/support/email/avoid-spam.aspx


Email server recipe for avoiding spam filters
http://blog.nahurst.com/email-server-recipe-for-avoiding-spam-filters


How can I prevent my mail from being classified as spam?
http://webmasters.stackexchange.com/questions/3728/how-can-i-prevent-my-mail-from-being-classified-as-spam


rDNS setup to prevent emails appearing as spam / phishing messages
http://serverfault.com/questions/516962/rdns-setup-to-prevent-emails-appearing-as-spam-phishing-messages