It's quite puzzling that major ISPs would have blacklisted mail servers and let their clients use them anyway. I told some IT dude for one organisation with which we do much business that their emails are not being received by my users because they were using AK's mail servers to realy their mail to their MX server [as per their DNS MX records] which is in the US. This morning I noticed yet another server for AK which is blacklisted in more than ten lists. I also found another one for orange Kenya also blacklisted in more than ten lists and that got me wondering if my security settings on my mail server are too tight. Finding local ISP's subnets is too much work - or rather I feel too lazy to do that. I have allowed messages from blacklisted servers to come in, but tightened AV scan settings. Anti-spam settings are tight already. I use MDaemon by the way, but I've integrated it with ClamWin, so I have two antivirus engines scanning my mail. On 29 April 2010 16:28, Odhiambo Washington <odhiambo@gmail.com> wrote:
On Thu, Apr 29, 2010 at 12:38 PM, Simon Mbuthia <simon.mbuthia@gmail.com>wrote:
Hi guys,
I've been receiving complaints lately from my users about messages not getting to them and on investigating, I have found that a number of local ISPs have blacklisted mail servers. Is it just me or is it common among admins on the list? I have configured my mail server to reject messages relayed by mailservers blacklisted by spamcop, spamhaus and barracuda and respond with a message explaining that action. Now this has got me wondering whether I have made my security settings too tight or what...
Is that too drastic a security measure that I have taken?
I used to do the same when I used to be Sysadmin, with one exception: I'd find out ALL the subnets used by ISPs in KE and exempt those from the filtering. I'd still monitor and look at my stats for culprits and contact them to address the issues, and yes, I was very much willing to cooperate with them towards addressing the issues.
I have a friend who is using Onecom's mail servers for outbound, and quite often the servers are blacklisted. One mail I shot to onecom's support about three weeks ago still remains unanswered to date! Demographics have changed, I believe.
-- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254733744121/+254722743223 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ "If you have nothing good to say about someone, just shut up!." -- Lucky Dube
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