Try reading the archives. This was brought up last week. Tell your user to get a ISP that does not play God like AOL does.
John Tolmachoff Engineer/Consultant/Owner eServices For You > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:IMail_Forum- > [EMAIL PROTECTED] On Behalf Of David Hayes-Moats > Sent: Monday, February 16, 2004 5:35 PM > To: [EMAIL PROTECTED] > Subject: [IMail Forum] error 550, relaying denied > > I have a user who connects to the Internet through AOL and sends mail > through our server. Lately (past week or so) he's been having problems > sending (but not receiving e-mail). When ever he tries to send, Outlook > Express gives him the following error message: > > The message could not be sent because one of the recipients was > rejected > by the server. The rejected e-mail was (hidden) Subject test account: > mail.kalnet.net server: mail.kalnet.net protocol SMPT server response 550 > 5.7.1 (hidded)... relaying denied IP Namelookup failed (172.154.2.78) > port: 25 Secure (ssl): no, server error 550, error no: 0x800ccc79. > > He has SMTP authentication enabled and we've tried specifing the > username/password and using the same one as for his pop account. He > receives this error no matter who he sends to, me, himself or somebody > outside my server. > > I have other users who connect through DSL, cable, other ISPs and they all > use SMPT authentication just fine. > > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
