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Thanks for your reply. The problem only happen with one user and he is using PDA to send. Everything works fine from a normal computer.
The guy use this GPRS internet supplied by a telecommunication company. he tried to configure his mail client software to use our company mail server and then tried again with the ISP mail server. Both couldn't allow him to send mail but both allow him to receive mails. Its weird.....
It is unlikely the blackhole list is blocking my company mail server because that is ok whn send from other our home or ffrom our company. The only possiblity is that the external address supplied by the GPRS ISP has been blocked by the blackhole list.....
maybe the external mail address supplied by the GPRS ISP got something wrong....I also not sure..
The only possiblity is that the external address supplied by the GPRS ISP has been blocked by the blackhole list
That sounds like what is happening - are you using sendmail? I'm not sure if the allow list (access db) overrides the deny list, but you may be able to add the IP address range he gets to your access db so he can send.
thanks for your help. I just figured out the problem. Yes you are right, the sender's mail server is in the list under
relays.ordb.org & list.dsbl.org.
I am using postfix, so I commented the two list, by doing that it enables all the previously blocked mails to come in.
However, isn't that a crappy solution? since I added those list initially to make use of the database to block spam mails, now i have to uncomment it just because one of the mail server blacklisted there is unable to send to my mail server.
It seems to me the relays.ordb.org and list.dsbl.org has wrongly blocked the address.
Does he have his own ISP though? If he does and gets an error sending mail through them, is it the same error? If it's a different error it may be easier to resolve that so he's not sending mail through your server which means you can leave the ordb rules in place.