Usman Afzal
asked on
Email Bouncing Back
Dear All,
Strange thing happened to me, Some mails are bouncing back with different Ip Address
For Exp
I have a Domain Treeadd.com and its mail server FQDN should be mail.treeadd.com
Treeadd.com have no ip address but Mail PTR record have 192.168.2.10
ASA 5510 Is Configure for port forwarding and its having address 192.168.2.1
When sending email, its should go with 192.168.2.10 address but its going with 192.168.2.1 and bouncing back
Remote Server returned 'Server #5.0.0 smtp; 550 The email sent from 192.168.2.1 by usman@treeadd.com was rejected by the receiving server as the sending server did not pass the required reverse DNS lookup.
Please Advice
Thanks,
Strange thing happened to me, Some mails are bouncing back with different Ip Address
For Exp
I have a Domain Treeadd.com and its mail server FQDN should be mail.treeadd.com
Treeadd.com have no ip address but Mail PTR record have 192.168.2.10
ASA 5510 Is Configure for port forwarding and its having address 192.168.2.1
When sending email, its should go with 192.168.2.10 address but its going with 192.168.2.1 and bouncing back
Remote Server returned 'Server #5.0.0 smtp; 550 The email sent from 192.168.2.1 by usman@treeadd.com was rejected by the receiving server as the sending server did not pass the required reverse DNS lookup.
Please Advice
Thanks,
ASKER
Yes
Its configured Properly
Its configured Properly
So check if Exteranl DNS resolution ok !
Hi,
It just looks like your DNS record isn't published at all for treeadd.com. You should fix that and you're set.
Cheers
It just looks like your DNS record isn't published at all for treeadd.com. You should fix that and you're set.
Cheers
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ASKER
configuration requirements over Cisco firewall for NAT
http://www.mustbegeek.com/configure-exchange-server-to-send-and-receive-outside-email/