Configure exchange to act as POP3 and SMTP server

Posted on 2005-05-13
Last Modified: 2006-11-18
We use MS Exchange on Small Business Server 2003.
Currently we get all our email through with POP3 connectors from our ISP mail accounts

We want to have the ability to allow remote email clients (Cell Phones actually) to collect mail from the exchange server by POP3 and send mail using the exchange server as SMTP.

Can anyone offer a step-by-step guide?
Please include details of relevant ports that need to be open on the firewall :)

Question by:kishenhawkins
    LVL 95

    Expert Comment

    by:Lee W, MVP
    You need to open ports 25 and 110.  But I strongly recommend against using the server as your cell phone's SMTP server.  Use the Cell companies SMTP servers.  Opening your SMTP port could get your domain(s) on blacklists if spammers detect the open SMTP.

    110 is POP3
    25 is SMTP

    I'm fairly certain, if those ports are open, then your set - I don't believe there is any further setup, but it's been a while...

    Also, be aware you are weakening your networks security by making mail available without requiring the use of VPN (which I doubt your cell phones have the ability to do).
    LVL 13

    Accepted Solution

    By enabling the POP3 service and checking exchange permission in AD is all you need to connect via POP3.  Make sure you have the option set to provide an outgoing username and password for the smtp service.  The fear that leew brought up is that sometimes people setup SMTP servers incorrectly and thus inadvertantly create open relays (smtp servers that require no password to send mail through).  In exchange 2000 and 2003 this should be taken care of by default. I use my cell phone through sprint to access the internet and use a clients SMTP server to send mail through outlook, works like a champ.  The other option is to use RPC over HTTP but this requires windows service pack1 and outlook 2003.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Shouldn't all users have the same email signature?

    You wouldn't let your users design their own business cards, would you? So, why do you let them design their own email signatures? Think of the damage they could be doing to your brand reputation! Choose the easy way to manage set up and add email signatures for all users.

    Set OWA language and time zone in Exchange for individuals, all users or per database.
    Find out how to use Active Directory data for email signature management in Microsoft Exchange and Office 365.
    In this video we show how to create a Resource Mailbox in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: Navigate to the Recipients >> Resources tab.: "Recipients" is our default selection …
    In this Micro Video tutorial you will learn the basics about Database Availability Groups and How to configure one using a live Exchange Server Environment. The video tutorial explains the basics of the Exchange server Database Availability grou…

    779 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

    14 Experts available now in Live!

    Get 1:1 Help Now