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https://www.dell.com/community/PowerVault/MD3200i-Email-Validation-Unsuccessful-Incorrect-return-code-from/td-p/4005001
Oct 17, 2012 · Confirmed that Ethernet Management Port is configured correctly, is listed in DNS and is reachable via IP and FQDN. Both admin server and exchange server are on the same logical network assigned to the same LAN. Return code: Validation unsuccessful. Incorrect return code from SMTP command.
https://www.lifewire.com/smtp-error-messages-1166422
Dec 20, 2019 · 550 - The requested command failed because the user's mailbox was unavailable (for example because it was not found, or because the command was rejected for policy reasons). 551 - The recipient is not local to the server.Author: Heinz Tschabitscher
https://serversmtp.com/smtp-error/
46 rows · It usually defines a non-existent email address on the remote side. Though it can be …
https://www.arclab.com/en/kb/email/smtp-response-codes-error-messages.html
Simple Mail Transfer Protocol (SMTP) is an internet standard for email transmission. SMTP is a text based protocol in which the sender communicates with the mail receiver by issuing commands and receiving a response code. Sample: C: MAIL FROM:<[email protected]> S: 250 Ok . In this sample the client issues the MAIL FROM command and the server replies with 250 Ok.
https://www.socketlabs.com/blog/21-smtp-response-codes-that-you-need-to-know/
17) 550 — The requested command failed because the user’s mailbox was unavailable for example because it was not found, or because the command was rejected for policy reasons.In addition, SMTP response code 550 is also commonly used to indicate additional instances of permanent failures.
https://support.oracle.com/knowledge/JD%20Edwards%20EnterpriseOne/1946237_1.html
Dec 19, 2019 · Using sendmail outside of JDE shows SMTP server is working fine. Jde.log shows 2096/3844 MAIN_THREAD Thu Oct 30 11:21:11.509002 XMLPUtil.cpp949 Send email failed with return code …
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-1-1-through-5-1-20-in-exchange-online
In the E-Mail Name Resolution section, click Clear Most Recent Recipients list, and then click OK in the confirmation dialog box. While you're still in Options, to return your mailbox to the full version of Outlook on the web, go to Outlook version, clear the check box for Use the light version, and then click Save. Log off and close your web browser.
https://www.dell.com/community/PowerVault/MD3000-Email-Alerts-Failure/td-p/4538883
Oct 17, 2014 · Input stream checking SMTP return code.... myVirtualMailServerName --> The mail (SMTP) server you specified can not be found .... smtp.gmail.com --> Validation Unsuccessful .
https://support.office.com/en-us/article/Sent-email-in-Outlook-com-comes-back-delivery-failed-45e048ac-f7b1-4c0f-b525-081cb34f1062
Host unknown or Domain lookup failed. If you receive one of these messages, the domain for the recipient's email address doesn't exist. If their email address is [email protected], the domain is example.com. Try this fix: Check the recipient's email address for typos. Ensure you have the current address and that their email service provider hasn't made a change to their domain name.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-7-1-in-exchange-online
If the recipient is external (outside of your organization): Contact the recipient (by phone, in person, etc.) and ask them to tell their email admin about your email delivery problem. Their email admin might need to reconfigure the recipient's mailbox so it accepts email from you.
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