All My Mails Are Going To Spam Instead Of Inbox

Hi

I am using ubuntu operating system
and installed zimbra mail server and
domain name server - bind 9 in ubuntu.

The installation of zimbra mail server is completed
and made an entry in DNS for mail server for
redirecting mail entries to that system.


In Forward zone :

ityug.com. IN MX vidyayug.ityug.com
vidyayug IN A 10.0.0.10


In Reverse Zone :

10 IN PTR vidyayug.ityug.com.

when i send mail to gmail or yahoo mail
the mail which i was sending is going to
spam instead of inbox.

And I am using Static IP address.

My doubt is :

In my DNS I didn't map with any public ip address ?

How can I map with public address ?

After configuring internal DNS did i need to map with any other things ?

Thanks...

 

Please do a search on the forum. This topic has already been discussed manytimes here.

 

I am new to Mail Server

And i heard that internet service providers will place ip's in black list
for avoiding spam.
But I did not get any article regarding this stuff.
Is that the reason my mails are going to spam.

 

http://www.howtoforge.com/forums/showthread.php?t=37795&highlight=SPF