smtp errors

I setup reverse dns per IP on the server hoping to fix this issue but it still resolves (client in Hawaiia and requires reverse dns)

1 usermail@aol.com R=lookuphost
T=remote_smtp: SMTP error from remote mailer after
MAIL FROM:: host mailin-02.mx.aol.com
[205.188.156.249]: 550 REQUESTED ACTION NOT TAKEN: DNS FAILURE

47 nobody@server.hostname.com: retry timeout exceeded

1 regsteward@wapda.com R=lookuphost T=remote_smtp: SMTP
error from remote mailer after end of data: host mail.wapda.com
[209.71.203.5]: 552-MessageWall: Message score (10)
has reached or exceeded maximum (10):\n552- 10 RMX/REJECT:
server.hostname.com: Your reverse path domain has
no MX or A records (reply mail would be undeliverable)\n552
MessageWall: This message is being rejected

40 root@server.hostname.com: retry timeout exceeded

1 email2@sbcglobal.net R=lookuphost T=remote_smtp: SMTP
error from remote mailer after MAIL FROM:
SIZE=1586: host sbcmx2.prodigy.net [207.115.57.16]:
553 5.1.8 ... Domain of
sender address nobody@server.hostname.com does not exist

1 useremail@testdomain2.com R=lookuphost T=remote_smtp: SMTP
error from remote mailer after RCPT TO::
host testdomain2.com [xx.x6.148.36]: 550-Verification
failed for \n550-unrouteable
mail domain "server.hostname.com"\n550 Sender verify failed

1 user@domain3.com R=fail_remote_domains: unrouteable
mail domain "domain3.com"

4 user3@domain4.com R=lookuphost T=remote_smtp:
SMTP error from remote mailer after RCPT TO::
host domain4.com [xx.46.148.36]: 550-Verification
failed for \n550-unrouteable
mail domain "server.hostname.com"\n550 Sender verify failed


What is causing such errors? I've check DNS and they are fine.

 

 

 

 

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