LinuxQuestions.org > Forums > Linux Forums > Linux - Software 5.1.2 unknown host error CentOS sendmail User Name Remember Me? Covered by US Patent. Sendmail can be configured in LOTS of different ways, with lots of different options. It indicates that the recipient's mail queue on their Exchange Server has been stopped (frozen), probably while the Network Administrator troubleshoots some problem. 441 - The recipient's server is not responding this contact form
There are sometimes circumstances where an email address appears to be valid but cannot be verified as definitely valid during the SMTP session between the sending server (your server) and the The "default policy" which all of the articles refer to when setting up additional domains in below it and does have the domain1 and domain2 address spaces in it...Thoughts anyone...ThanksMickey Metcalf Alan 0 Featured Post 6 Surprising Benefits of Threat Intelligence Promoted by Recorded Future All sorts of threat intelligence is available on the web. email address) were not valid. https://social.technet.microsoft.com/Forums/exchange/en-US/23ca9540-be96-4534-ae81-73474208e051/512-unknown-host?forum=exchangesvradminlegacy
The SMART_HOST line you had was: Quote: define(`SMART_HOST', 'smtp-server.nyc.rr.com') Notice that you put the smart host name in two single quotes (') which is fine for shell scripts but bad for Other users on the network were then able to send email to the user in question. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Good luckBest Regards Don't forget to mark it as answer if it helps Tuesday, September 20, 2011 3:05 PM Reply | Quote 0 Sign in to vote The way i understand
Get 1:1 Help Now Advertise Here Enjoyed your answer? However if i try to send to ANY external email address i recieve this below. Having a problem installing a new program? Smtp Error 451 Check the size of the email you sent, and, specifically, the size of the attachments you included, and consider splitting your email into smaller emails.
Search this Thread 04-08-2006, 10:37 AM #1 MarcusG LQ Newbie Registered: Feb 2005 Location: New York City Distribution: Slackware Posts: 22 Rep: Sendmail Error 550 Host Unknown I've struggled SMTP Error 471 (or 4.7.1) is usually tagged onto a primary SMTP error code, for example "SMTP Error 450 4.7.1", or "SMTP Error 451 4.7.1", or "SMTP Error 550 4.7.1". Notice the SMART_HOST declaration uses the backtick (`) as the beginning quote and the single quote (') as the end quote. http://www.aspiresoft.com/email-server-status-codes/ Either fix will work, and it's not a fault/feature of either system that it works like that.
The microsoft people blame linux and linux people blame microsoft. 5.5.0 Smtp 554 For example, a typical return error message might be : "
This can happen for example in very large corporation where the first email receiving server might only be an email exchanger server, a gateway server to the eventual server which holds More hints This error is usually due to overloading at the ISP from too many messages or transient failures. Smtp Error Codes 550 The error message is effectively saying that the email addresses listed do not exist, or no longer exist (if you used to be able to email to them successfully). 5.0 0 Smtp From there, it's not working correctly...external mail isn't going out.
Login. weblink If your SMART_HOST line had been this: Quote: define(`SMART_HOST', `smtp-server.nyc.rr.com') it would have worked just fine. please help. When viewing the user in AD, his email was clearly trying to go to @domain.local instead @domain.com. Smtp Error 553
X.400), or A message was sent to a recipient who was identified as a member of a routing group that was deleted. Are you new to LinuxQuestions.org? Go to Solution 5 Comments LVL 76 Overall: Level 76 Exchange 65 Email Servers 20 Server Software 3 Message Active today Expert Comment by:Alan Hardisty2012-05-14 Please check the default email navigate here As above, the next attempt to send by your server may prove successful.
Again, this can either be dealt with by telling the Exchange server to accept mail from server.domain.com, or by configuring sendmail to use the masquerade option, and making everything show up What Does Http Server Code 200 Mean? Solved Exchange 2003: Returned mail 550 5.1.2 Posted on 2012-05-14 Exchange Server Software Email Servers 1 Verified Solution 5 Comments 1,984 Views Last Modified: 2012-05-15 First off, I am not exchange Join the community of 500,000 technology professionals and ask your questions.
Microsoft Exchange will not try to redeliver this message for you. Your cache administrator is webmaster. centauricw View Public Profile View LQ Blog View Review Entries View HCL Entries View LQ Wiki Contributions Find More Posts by centauricw 04-09-2006, 09:51 AM #5 MarcusG LQ Newbie 501 5.1.3 Invalid Address Telnet Note : this error, particularly if repeated, can be indicative of communications problems, such as a noisy line, intermittent drops in network connections, etc... ------------------------------ SMTP Reply Code 503 is nowadays
However if i try to send to ANY external email address i recieve this below. Definition of SMART_HOST shud be taken care with utmost care. Sorry it didn't work out.
Introduction to Linux - A Hands on Guide This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started Does sendmail send out directly to the internet or does your Exchange?James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com Tuesday, September 20, 2011 3:00 If the email was addressed externally, then the recipient's email address was misspelt. 511 - Bad Email Address (also called SMTP Error 5.1.1) SMTP Error 511 : Bad email address. was able to correct the issue following the post...
or With Yahoo, on the other hand, this usually means the email address does not exist or has been disabled. (also called SMTP Error 5.5.4)
I walked into this setup so i have to deal with it. The next attempt to send by your server may prove successful. I love this. CIWEB2 is the linuxserver ciexch is exchange 2007 server.
I wish everything was either microsoft or linux, my life as an admin would be a lot easier, but this is not the way the world works.