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Thread: How is email fowarded to an exchange server.

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    How is email fowarded to an exchange server.

    2nd question for the evening im afraid

    usually when your home computer picks up mail from your isp's mail server it's usually pop3 service.


    but what service is it when your email host fowards your mail to your static ip -> exchange mail server?

    i'm asking cos im trying to set up the essential rules in our firewall here.... there are predefined settings for pop3, MAIL and a hundred other things.

    What should i open up to allow our precious mail through?

    I dont want it falling in the mud.


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    Re: How is email fowarded to an exchange server.

    It's SMTP (25/tcp) that transfers mail from my PC to my mail server.

    However, you mentioned Exchange, did you literally mean Microsoft Exchange? If you did, are you connecting to it using an Outlook client or another client? I don't remember off handf what ports Outlook will use to communicate with an Exchange server.

    As far as firewall rules go, if you're relaying your email through another server (your ISP's for example) then you'd just need to open 25/tcp to that mail server. If your mail server is doing the end delivery itself then you'd need 25/tcp open to any destination.

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    Re: How is email fowarded to an exchange server.

    110, 25 is all you need

    Unless you are running Outlook Web Access or connection via HTTPS - it depends how your client machines are setup to connect.

    Also do you know if your domain MX records point straight at your server or via an ISP who does SPAM checks on it?

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    Re: How is email fowarded to an exchange server.

    You aren't going to open up your exchange server to the internet directly surely?....

    I mean i've not been doing my IT role for long but know how critical our mail server is and its the last thing i'd do to open up the exchange server directly.

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    Re: How is email fowarded to an exchange server.

    you can open it up as long as you don't allow it to be an open relay.

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    Re: How is email fowarded to an exchange server.

    "pop doesn't exist in the real world" = Jiff Lemon

    Quote Originally Posted by Advice Trinity by Knoxville
    "The second you aren't paying attention to the tool you're using, it will take your fingers from you. It does not know sympathy." |
    "If you don't gaffer it, it will gaffer you" | "Belt and braces"

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    Re: How is email fowarded to an exchange server.

    Hi peeps, no it's not sitting open to the net.

    We have a netscreen 5gt firewall. the mail server sits behind this. I am setting up a mapped IP address where the netscreen will foward filtered traffic for one of our static IP's to the internal private ip of the exchange server.

    The firewall wants to be told what services should be allowed.... obviously i want the mail the email host is sending (which has already been scanned) to get through.

    so my question was - what service/ports will this mail get sent as? pop3?smtp? I saw a setting called MAIL, has that got anything to do with it?

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    Re: How is email fowarded to an exchange server.

    i think David has answered my question? the email will be sent in on pop3??

    and thanks for reminding me about the remote access..


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    Re: How is email fowarded to an exchange server.

    Quote Originally Posted by funnelhead View Post
    i think David has answered my question? the email will be sent in on pop3??
    Nope, SMTP. POP3 is for a client to download email from the server.

    A service called 'MAIL' could have several services rolled into it, POP3 (110/tcp), SMTP (25/tcp) & IMAP4 (143/tcp) spring to mind.

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    Re: How is email fowarded to an exchange server.

    Yep

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    Re: How is email fowarded to an exchange server.

    So....how will they be sending it to me?

    lol, should i just ring them and ask them? was kinda hoping to avoid that... it would be embarrassing
    Do you think when Jesus comes back..... he ever wants to see another cross.......? *{God bless you Bill}

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    DR
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    Re: How is email fowarded to an exchange server.

    It will be an SMTP feed which comes in from senders mail server when it does a lookup on the MX record....

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    Re: How is email fowarded to an exchange server.

    Let's assume that your Exchange server is responsible for mycompany.com. When someone sends an email to mycompany.com a DNS lookup is made by that persons SMTP relay server. That DNS query looks for the MX (Mail exchanger) record(s) for mycompany.com. That SMTP server receives an answer saying that exchange.mycompany.com is responsible for receiving email for mycompany.com.

    That relay server then connects to exchange.mycompany.com and initiates an SMTP transfer.

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    goatboy funnelhead's Avatar
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    Re: How is email fowarded to an exchange server.

    ah ok, i get ur point - it's not being collected by pop3 by my server....rather its being sent by SMTP by the source mail server.
    Do you think when Jesus comes back..... he ever wants to see another cross.......? *{God bless you Bill}

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    Re: How is email fowarded to an exchange server.

    Spot on

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    goatboy funnelhead's Avatar
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    Re: How is email fowarded to an exchange server.

    are you at work?

    edit: and do you know anything about using routers in bridge mode
    Do you think when Jesus comes back..... he ever wants to see another cross.......? *{God bless you Bill}

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