Re: what ports does sendmail /popper use?

From: Matthew Goldman (matthew@goldmaninternet.com)
Date: 05/28/02

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    From: Matthew Goldman <matthew@goldmaninternet.com>
Date: Tue, 28 May 2002 09:39:03 +0930

    mischa wrote:
    > I know sendmail uses tcp 25 and pop is on 110 tcp
    >
    > but when i block all other ports my mail server fails. i get an error along
    > the lines htat it cant resolve the domain. 53 is also open? does it need to
    > have anothr port open? the udp ports?
    >
    >

    You will need port 53 open in order to process DNS lookups. 

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