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Exchange 2007 Mass Email Bouncebacks

Discussion in 'Web & Email' started by OSCS, Nov 21, 2011.

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  1. OSCS

    OSCS Thread Starter

    Nov 21, 2011
    I work in a small corporate environment on a all Microsoft server network/domain.
    We have Exchange 2007 SR1 on a Windows Server 2008R2 server.

    Our CEO sent out a mass email. Same email to almost 300 addresses. All the emails came back.
    My exchange server is set to allow 5000 addresses and a 130MB pipe.
    I sent the email out in smaller groups using her account and only 24 bounced.

    I suspect my ISP has a spam filter in place. My director doesn't believe so. He thinks it's the server.

    Are ISP's (like XO) setting up spam filters? It there a way around them?

    Thank you.
  2. srhoades


    May 15, 2003
    Some anti spam products, and SBS 2011 use directory harvesting, if a non-existent email exists in an email addressed to multiple people at the same organization, it will bounce the whole email. The number of non-existant email addresses that can be allowed can be increased, but by default it is 1 on some cases.
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