Thanks Chris, it's a firewall that "allows" the null sender. I'll check the rules to see if it does subsequent blocking obviously the best idea would be to drop it at that point
Sender is a government agency, seems stereotypical that they would talk but not want to listen...hahahaha Cheers Dean -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chris Scharff Sent: Tuesday, 30 August 2005 10:37 a.m. To: Exchange Discussions Subject: RE: can't send to a company Oh.... lol... your non-RFC compliant gateway seems to 550 mail with a null sender. Uh... You shouldn't do that. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chris Scharff Posted At: Monday, August 29, 2005 5:30 PM Posted To: swynk Conversation: can't send to a company Subject: RE: can't send to a company Seems pretty straight forward.... "Sender verification failed" Something is wrong with the sender. How do they know that? "Sending test bounce to [EMAIL PROTECTED] 550 failed" Sending a bounce message to deanc failed? How could that be? Let's test. telnet smtp.nrc.govt.nz 25 220 NRC Mail ehlo foo.bar 250-Hello foo.bar, pleased to meet you 250 SIZE mail from:<> 250 <> ... Sender ok rcpt to:<[EMAIL PROTECTED]> 550 Mailbox unavailable. Yep. They verify the sender is valid. Your mail server says it isn't so they don't accept mail from invalid users. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dean Cunningham Posted At: Monday, August 29, 2005 4:08 PM Posted To: swynk Conversation: can't send to a company Subject: RE: can't send to a company What about this one then? The following recipient(s) could not be reached: [EMAIL PROTECTED] on 25/08/2005 23:12 The e-mail system was unable to deliver the message, but did not report a specific reason. Check the address and try again. If it still fails, contact your system administrator. < nrc15.nrc.govt.nz #5.0.0 smtp; 550-Verification failed for <[EMAIL PROTECTED]> 550-Called: 210.55.18.178 550-Sent: RCPT TO:<[EMAIL PROTECTED]> 550-Response: 550 Mailbox unavailable. 550-Sender verification failed (Sending test bounce to [EMAIL PROTECTED] 550 failed).> It does not look like a DNS lookup problem, more it is trying to check if I am a valid user. 210.55.18.178 is my firewall that relays the in/out email For the record we do not have a PTR for this IP, but this error does not appear to indicate that problem? Cheers Dean -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Crowley [MVP] Sent: Tuesday, 30 August 2005 4:31 a.m. To: Exchange Discussions Subject: RE: can't send to a company You should begin every post and subject line with "Friggin' Lyris" and you won't have any problems. Contact the correspondent's postmaster to try to find out what kind of filtering they're doing. The message you've received indicates that they might be doing some thing like reverse DNS checking. Do you have a proper PTR record for your domain? Ed Crowley MCSE+Internet MVP Freelance E-Mail Philosopher Protecting the world from PSTs and Bricked Backups!T -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Chinnery, Paul Sent: Monday, August 29, 2005 9:03 AM To: Exchange Discussions Subject: can't send to a company Exchange 200 server We are having trouble delivering to two different companies. The error I am getting is: <mmc-mail #5.5.0 smtp;504 <mmc-mail>: Helo command rejected: need fully-qualified hostname> Yet, we have no problem delivering, for example the Exchange Discussion list, and almost everybody else. I assume this is an attempt by these companies at spam control but I don't know the solution to the problem. Our DNS is hosted by our ISP. Can someone suggest a simple or even not-so-simple solution to my dilemma? PS Boy, that Lyris sure is stringent about subject lines. It rejected 2 of my posts due to the subject line. Paul Chinnery Network Administrator Memorial Medical Center _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/read/?forum=exchange To subscribe: http://e-newsletters.internet.com/discussionlists.html/ To unsubscribe send a blank email to [EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. 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