Mailbox unavailable The server response was 5 7 1 Unable to relay for abc xyz com

Question

I am getting  Mailbox unavailable  The server response was  5 7 1 Unable to relay for abc xyz com  when I try to send the mail using ASP NET  The site is deployed on IIS7  Windows 2008 server   The website was working fine on IIS6 and Windows 2003 Server  I deployed it on IIS7  2008 it has started giving me this error   Has anybody experienced this before

User · Answer

Wanted to share what caused the error in my case. Spend couple hours to figure this out, so hopefully it will help to save someone some time.

Strangely enough, the error was raised with the Enable drop directory quota setting being enabled for the domain.

I am not the expert and don't know the technical explanation, but unticking the mentioned setting sorted the problem.

User · Answer

Thanks to Vinod for the well presented answer   I got the same error as Mick Byrne when I followed the steps above  Turning it back to All Unassigned sorted it but I had to tweak a few other things as well    Add the user my site was running under to the users on the Security Tab in SMTP Virtual Server  Changed the value in the mailSettings   network   host attribute in my web config to the specific server IP  for example 192 168 100 120  as opposed to localhost  which was pointing at 127 0 0 1 in the hosts file     Hope this saves someone a few mins of messing about

User · Answer

Aahh got it    I got it working     Thanks Christopher  your suggesion is correct   But  finding  Default SMTP Virtual Server  was tricky     Even if you use IIS7 to deploy your web site  you have to open IIS6 Manager to configure SMTP server  why     I configured SMTP server as follows to make things work    Open IIS6 Manager using Control Panel --  Administrative Tools  Open SMTP Virtual Server properties  On General tab  Set IP address of the Web server instead of  All Unassigned   In Access tab  click on Relay button  this will open Relay Restrictions dialog  In relay computers list  add the loopback IP address i e 127 0 0 1 and IP address of the Web server  so that they can pass relay emails through the SMTP server

User · Answer

If you have Exchange 2010    In my case  the error message didn t contain   for abc xyz com    This shows how to add a receive connector  http   exchangeserverpro com how-to-configure-a-relay-connector-for-exchange-server-2010   But I also needed to perform a step found here  http   recover-email blogspot com au 2013 12 how-to-solve-exchange-smtp-server-error html        Go to Exchange Management Shell and run the command   Get-ReceiveConnector  JiraTest    Add-ADPermission -User  NT AUTHORITY ANONYMOUS LOGON  -ExtendedRights    ms-Exch-SMTP-Accept-Any-Recipient       While working on this  I ran the following on the affected server s PowerShell console until the error went away   Send-MailMessage -From  myemail server com au  -To  myemail server com au  -Subject  Test Email  -Body  This is a test

User · Answer

herein lies the answer    IIS Settings  IIS-- Default SMTP Virtual Server-- Properties-- Access-- Relay restrictions just add or exclude the IPs you care about  should resolve the issue

User · Answer

As a picture is worth a thousand words    When you find the IIS6 manager  I have found that searching for IIS may return 2 results  go to the SMTP server properties then  Access  then press the relay button    Then you can either select all or only allow certain ip s like 127 0 0 1

User · Answer

I was able to fix this issue by changing the mail settings in the system net portion of my web config    lt mailSettings gt       lt smtp deliveryMethod  Network  gt           lt network host  yourserver  defaultCredentials  true   gt       lt  smtp gt   lt  mailSettings gt

User · Answer

I was facing the identical problem and followed the  very clearly spelled out  steps in Vinod s reply  however this then created a different error   Unable to read data from the transport connection  net io connectionclosed  I did a bit more digging and poking around and  while I m not sure why this worked  I solved it by  - Going back into IIS6 0 management console - Open SMTP Virtual Server properties - On General tab  changing the  IP Address   setting back to   All Unassigned      Not sure why this works  but hopefully will help out someone facing the same problem in the future

[asp.net] Mailbox unavailable. The server response was: 5.7.1 Unable to relay for [email protected]

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