Email problems, reverse lookup?

Posted on 2009-02-18
Last Modified: 2012-08-13
We just switched over to Verizon as our DSL carrier and are starting to have some odd issues.  I am sure it has something to do with the DNS settings an reverse lookups for the remote mail server in that ours is registering with the internal name ( and the IP address is registering as the big long nasty thing from Verizon (see below) and the two are not matching.  Have you seen this and do you have any suggestions?

You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            < #5.7.1 smtp;554 5.7.1 <verizon static IP>: Client host rejected: Please use your ISPs Mail Servers.  Goodbye. CLIENT>

Do I just need to add the to the smtp virtual server setting?  (Exchange 2003, spt2)
Question by:globalwm
    1 Comment
    LVL 65

    Accepted Solution

    You need to get your ISP to change the reverse DNS entry to (ie what the DNS host is). It would appear that the remote site is rejecting the email because it looks like a dynamic IP address.

    You need to set the SMTP virtual server correctly as well, but if the reverse DNS is wrong then that will be the primary rejection method.


    Featured Post

    Enabling OSINT in Activity Based Intelligence

    Activity based intelligence (ABI) requires access to all available sources of data. Recorded Future allows analysts to observe structured data on the open, deep, and dark web.

    Join & Write a Comment

    Suggested Solutions

    Email statistics and Mailbox database quotas You might have an interest in attaining information such as mailbox details, mailbox statistics and mailbox database details from Exchange server. At that point, knowing how to retrieve this information …
    Use email signature images to promote corporate certifications and industry awards.
    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…

    746 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

    15 Experts available now in Live!

    Get 1:1 Help Now