Error 501 Sender Ip Must Resolve
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Reverse Ip Lookup
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Reverse Lookup
21,637 Views Last Modified: 2011-08-18 We are running Exchange server 5.5 on WinNT SP6, with Outlook 2000 as the client email. All users sending email to a specific address outside our domain receive an error message [501 5.7.1
MailEnable Standard Edition Sender IP Must Resolve Post Reply Search Advanced search 2 posts • Page 1 of 1 radianation Posts: 1 Joined: Tue Feb 07, 2006 8:26 am Location: Louisville, KY Sender IP Must Resolve Quote Postby radianation » Tue Feb 07, 2006 8:30 am MailEnable: Message Delivery Failure.The following recipient(s) could not be reached: Recipient: [SMTP:hisname@hisdomain.com] Reason: 501 5.7.1
Sender IP Must Resolve The email server that sent the original message to us does not have DNS setup correctly for it. The error "Sender IP must http://www.webspinners.net/IPResolveError.htm resolve" means that they have no reverse lookup for the IP address https://community.spiceworks.com/topic/628292-mdaemon-smtp-error-501-domain-must-resolve of their outgoing email server. Our secure email server requires that MX records for the sending domain, and reverse DNS for the sending IP address be properly configured. Internet Standards have required this for email servers since 1990. The domain administrator for that system must error 501 add a PTR record for the IP address of their outgoing email server pointing to the machine that is their outgoing email server. For the purpose of this example we will assume that the IP address of your mailserver is 175.165.208.21 and you are using Microsoft DNS on NT 4.0 Server. Click the thumbnails on the right to error 501 sender see full size screen shots. From DNS manager (if you're not sure where that is then Click - Start -> Programs -> Administrative Tools -> DNS Manager) right click on your primary 208.165.175.in-addr.arpa zone, pick New Record from the popup menu ... Once the New Record dialogue box appears, click PTR in the Record Type area, click in the IP Address box and type in your IP address 175.165.208.21, click in the Host DNS Name box and type the fully qualified domain name of your mailserver - myserver.mydomain.com - then click OK. Once you have added the PTR record we should be able to receive your email, although it could take a while for this change to propagate if the information is cached. Web Spinners, LLC Phone: 412-798-4676 Webmaster@WebSpinners.Net Your privacy is respected and held confidential. Please view our privacy policy. Copyright 1996-2010 Web Spinners, LLC All rights reserved. No portion of this sites code or images may be used with our written consent.
server to Office 365 Email marketing program Rolled out Salesforce and Genius email marketing program targeted toward Collegiate Athletics staff Google Apps for Education Move in-house Student email to Google Apps for Education TECHNOLOGY IN THIS DISCUSSION Join the Community! Creating your account only takes a few minutes. Join Now I don't know what I did wrong or right, but right now my MDaemon is showing error 501: Domain must resolve while trying to send emails. I can receive emails normally, but can't send them. Everything was working fine this morning, but I must've ticked something while reviewing the security settings. Help. Any ideas? Reply Subscribe RELATED TOPICS: smtp error SMTP Error 550 554 5.4.4 SMTP error with FaxFinder device   15 Replies Jalapeno OP Ian (Alt-N) Nov 4, 2014 at 7:42 UTC Brand Representative for MDaemon (Alt-N Technologies) I'd like to see the full SMTP log snippet for this error to get a better idea of where the session is failing. Please mask your domain while posting the logs to this public forum to avoid unwanted connections to your server. Thanks, 0 Ghost Chili OP starg33ker Nov 4, 2014 at 7:42 UTC This is what I discovered. "SMTP Error 501 : The command was correct and recognised, but the parameters (the arguments, e.g. email address) were not valid. For example, the following email address will definitely give an SMTP Error 501 with most mail servers, happy\_larry@hotmail.com, as “\” is not allowed in email addresses, which makes this email address invalid. In the vast majority of cases SMTP Error 501 is caused by invalid email addresses, an invalid domain name recipient, or a Unix / Linux SEND MAIL command which does not follow the established standards. For example, a typical return error message might be : “ does not like recipient. Remote host said: 501 Invalid Address”. In cases where the error is not caused by an invalid email address, or by the failure to assign a valid email address to the mandatory “From” property, an SMTP Error 501, particularly if repeated, can be indicative of communications problems, such as a noisy line, intermittent drops in network connections, etc... ------------------------------ If you write your own SMTP program, rather than use established SMTP software, you may get a 501 error if you send to recipients hosted on a Microsoft Exchange server and you add a trailing space or dot to the domain name in your programming code. In such case you will t