On Tue, Jun 1, 2010 at 8:54 AM, kannan krishnamurthy
<[email protected]> wrote:

> In my work place we are having mail distribution server (locally mail id's 
> and passwords created in this server) and we are having a catch all box in 
> mumbai. every 15 min our local server fetch the mail and redistribute the 
> mails locally.
>
> We are using zimbra server. To fetch the mails we are using our catchall box 
> ip and for sending mails it will go directly from our local mail server using 
> Airtel static ip.
>
> We are having multiple domains in the same server most of them are hosted 
> with the same service provider(softcell) and the ip's are the same.
>
> My query is that at present my static ip is blocked by RBL sites. Now i want 
> to use my isp (softcell / catch all box) smtp ip. is it possible if yes can 
> you please help for the same.
>
> And MY isp (softcell) is using SMTP port is 2525.

In your setup, it is best to use your Email Service Provider's SMTP
server as the "outgoing" host.  Otherwise, you will be constantly
fighting RBL list providers to unblock your IP.  Furthermore, assuming
that your IP is not blocked, some sites like AOL (IIRC) will not
accept emails unless the MX record and PTR  record (for the MX host)
match.

You have not mentioned which program you are using for your MTA
(sendmail, qmail, postfix, exim to name a few).    Each of them can be
configured to send outgoing message via "smart smtp host" which would
be your providers SMTP host.   Make sure your provider will allow
relay before attempting the changes in your settings o/w you will
going around in a circle.

HTH,
-- Arun Khan
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