I am really at my wits end with my exchange server How can it reject every single yahoo.com email regardless of who sends it and yet love every gmail.com email? Verizon.net emails also bounce back If anyone has even a shred of an opinion on the matter or some insight I'd be VERY interested to know I have called tech support for my firewall and ISP...neither is blocking Yahoo This is an exchange issue kaneandrew@hotmail.com Below is the error message I've been wrestling with for way too long Hi. This is the qmail-send program at yahoo.com.I'm afraid I wasn't able to deliver your message to the followingaddresses.This is a permanent error; I've given up. Sorry it didn't work out. <akane@aicenter.us>:216.158.63.210 does not like recipient.Remote host said: 550 Requested action not taken: mailbox unavailableGiving up on 216.158.63.210. --- Below this line is a copy of the message. Return-Path: <andrewjkane@yahoo.com>Received: (qmail 23784 invoked by uid 60001); 17 Jul 2007 16:55:17-0000DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Receivedate:Fromubject:To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-ID; b=XyhLEC/BDVosShnNLpdN54OxTZ7SLUG2Pz4S9dvXuSrKeNpgGtGMnxUsk6U/aS+DIiCDNscTht7a2zazrsVrwKPzgDU9H+IUevfAuHtVTyqmxXj5ccf1sr2HpEOa30oWPWWOC2zjabwou/B/qyFSc3WDuvzeVSsuhNvjVBKjdg8=;X-YMail-OSG:hYH4EQYVM1n1CCKcsxm.VfiQ.3_cqtpaF5Z79eYbJFnVmfx5KyFnAbcrfcAIPHD3BD8qJlmF6y1Sp9vuJdr_2GX4KXLP.SfWx8F4pb4gp07hXWTbQFI4o2U1GFOPxvltzoDJ_4qaAIflFl2R_yIEOQ--Received: from [216.158.63.214] by web53309.mail.re2.yahoo.com viaHTTP; Tue, 17 Jul 2007 09:55:17 PDTDate: Tue, 17 Jul 2007 09:55:17 -0700 (PDT)From: Andrew Kane <andrewjkane@yahoo.com>Subject: testTo: akane@aicenter.usMIME-Version: 1.0Content-Type: multipart/alternative;boundary="0-1941546865-1184691317=:22419"Content-Transfer-Encoding: 8bitMessage-ID: <94596.22419.qm@web53309.mail.re2.yahoo.com> --0-1941546865-1184691317=:22419Content-Type: text/plain; charset=iso-8859-1Content-Transfer-Encoding: 8bit

I am assuming that aicenter.us is your real domain. I did a MX record check for your domain, and this is what I found: J:\>nslookup -q=mx aicenter.usServer: phmakdc01.jicpac.pacom.milAddress: 198.201.27.67 Non-authoritative answer:aicenter.us MX preference = 10, mail exchanger = smtp.aicenter.usaicenter.us MX preference = 20, mail exchanger = mail.aicenter.usaicenter.us MX preference = 30, mail exchanger = queue.dca.netsmtp.aicenter.us internet address = 216.158.63.210 I then tried TELNET smtp.aicenter.us 25 This yielded a black screen. I never saw an SMTP banner, so I'm assuming that your firewall is applying some type of SMTP filter or screening system in place. Do you know if this is the case? If your firewall was allowing inbound SMTP directly to your E2K server without any filters, I *should* see the W2K/E2K SMTP banner. Is this a new problem or has it always been happening?

i received a 550 type error when I tried to send mail from or exchange server's SMTP connector, but the machine i sent from did not have the MX record designating it as the official mail server for that particular domain. My emails were rejected from AOL and a couple others. They reject in an effort to reduce spam from bad folks pretending to be someone else. Also, I understand that even if you are the legit MX holder/machine, it's possible to become inadvertantly blacklisted. That I haven't dealt with, just read about. regards, Patrick

It seems like Andrew's problem is that his mail server is rejecting messages from Yahoo. Yes, Yahoo almost always rejects mail from my servers on the first try. They may have stopped doing this, but for a while they were.