First, let me say that I'm coming into this with very little knowledge of Linux, but a optimistic desire for some simple direction regarding a RedHat Fedora 5 mail server with issues connecting to BlackBerry Internet Service (BIS). My work email account is on a POP3 Linux server. When I got my personal BlackBerry at Christmas, I set it up with several accounts (all BIS, including my work account) and it worked fine for about 10 days. My work account has since worked sporadically - I may get all of my work email for a day, then nothing for a week, then I'll get all of the messages at once from the previous week; or it may not pick up any mail at all for this one account. There are about 30 BlackBerry users in the system, and this is happening to most (probably all) of them with their work accounts. My three other personal accounts (gmail, live, att.blackberry) all work great. I've upgraded OS, deleted and recreated account multiple times, deleted and resent service books more times than I can count, battery pulled, and settled for now for Outlook forwarding to my att.blackberry account, but that requires my PC be left on, and a simple "reply" sends the message back to my PC, instead of the original sender. It has to be our mail server. . . Any other suggestions? AT&T wasn't too helpful. They could see the BIS hitting email server but not getting messages. I've also been on the phone with RIM support twice, and they said it may be our mail server. According to our IT department, it shouldn't be blocking access. It is "wide open". RIM did send an email message regarding SMTP, Integration, and Polling, but our IT guy is not sure where these settings go, as he is new to the system and not familiar with Linux mail server setup. Can anyone tell me where this SMTP information needs to go? Is it a cut and paste, or is there additional coding needed? Is there some other setting on the server that needs to be changed? I'm not the IT person in the district, but I'm leading the push to get this working correctly. Pertinent section of message from RIM below: __________________________ To provide proper communication between the BlackBerry Internet Service and your email messaging environment, the below Internet Protocol (IP) ranges allowed to must be allowed to communicate with the BlackBerry® Infrastructure. Note: The IP ranges listed in the table are in Classless Inter Domain Routing (CIDR) notation. IP Address Netmask 18.104.22.168 / 24 Netmask = 255.255.255.0 22.214.171.124 / 24 Netmask = 255.255.255.0 126.96.36.199 / 24 Netmask = 255.255.255.0 188.8.131.52 / 20 Netmask = 255.255.240.0 184.108.40.206 / 20 Netmask = 255.255.240.0 220.127.116.11 / 19 Netmask = 255.255.224.0 18.104.22.168 / 21 Netmask = 255.255.248.0 The following table lists the Simple Mail Transfer Protocol (SMTP), integration server, and polling server information for BlackBerry Internet Service in North America (NA). SMTPs Smtp0[<1-5>].bis.na.blackberry.com Eg. smtp01.bis.na.blackberry.com has address 22.214.171.124 Integration Servers ten[<1-43>].bis.na.blackberry.com Polling Server Bda[<1-384>].bis.na.blackberry.com ____________________________ Thanks.