Cannot send mail to a mail  server using postini

Posted on 2005-05-11
Last Modified: 2011-09-20
I have and exchange 2003 SBS server and it has problems sending email to a server that uses postini.  I am not familiar with postini and unless you one of their customers, getting information from them is difficult.   I have checked the ip address of my exchange server on dnsstuff and it shows that I am not blacklisted anywhere.  What in postini then is preventing me from sending mail to it.

As always any help is  greatly appreciated.
Question by:adsnetcurve
    LVL 1

    Expert Comment

    Most likely the reverse lookup records for your domain do not exist,
    or they resolve to your provider instead of to yourself.

    You could check this with a trick.
    If you instruct your mailserver to deliver all outgoing mail NOT directly to the addressee's mailserver, but instead deliver it to your provider's SMTP server...  or or

    Then, most likely, the mails will be accepted.

    LVL 104

    Accepted Solution

    Sounds like postini is doing what the client is paying it to do, but as with all of these types of solutions some legitimate customers will get caught.

    As already said, make sure that you're reverse DNS entries are correct. You may also be blocked if you are on a DSL or other dynamic IP connection.

    Check how your domain is currently setup with
    Check your IP address for blacklists to see if the IP address is listed:

    The way round it is to use an SMTP Connector. This lets you route emails for domains protected by postini via your ISP.
    My web site at has more information on setting one up.

    Exchange MVP.

    Featured Post

    Do You Know the 4 Main Threat Actor Types?

    Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

    Join & Write a Comment

    Set up iPhone and iPad email signatures to always send in high-quality HTML with this step-by step guide.
    Use these top 10 tips to master the art of email signature design. Create an email signature design that will easily wow recipients, promote your brand and highlight your professionalism.
    To show how to create a transport rule in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Rules tab.:  To cr…
    To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…

    728 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    20 Experts available now in Live!

    Get 1:1 Help Now