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"554 5.7.1 [R8] Authentication Failed, must login ...

    https://answers.microsoft.com/en-us/office/forum/office_2013_release-outlook/554-571-r8-authentication-failed-must-login/aef453c3-9e7b-4ae7-a848-b87b68385f71
    Aug 21, 2014 · When I send a message, it is returned with this error code - "554 5.7.1 [R8] Authentication Failed, must login." How do I fix this?
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Solved: Sending mail in Outlook - occassional failure - BT ...

    https://community.bt.com/t5/Email/Sending-mail-in-Outlook-occassional-failure/td-p/1576595
    Server error: '554 5.7.1 [R8] Authentication Failed, must login.' At a rough guess I would say about 10% of my mail is affected in this way. I do not understand why …
    Status:Online

Outlook. error 554 authentication failed, must login

    http://www.office-outlook.com/outlook-forum/index.php/m/260812/
    Jan 02, 2008 · >>> 554 Authentication Failed, must login >> So did enabling authentication to your SMTP server in the e-mail >> account defined in Outlook help to get rid of the error?
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error 554 authentication failed, must login PC Review

    https://www.pcreview.co.uk/threads/error-554-authentication-failed-must-login.3370814/
    Jan 02, 2008 · I get a message from the System Administrator, saying "554 Authentication Failed, must login" This started about Oct. 15, and I switched to Thunderbird as a mail client, and thought the upgrade to 2007 would siolve the problem, but it has not. I have no problems in Thunderbird, but I perfer using Outlook. Any ideas as to
    Status:Online

error 554 authentication failed, must login - Google Groups

    https://groups.google.com/d/topic/microsoft.public.outlook.general/uazyUH94PRc
    Jan 02, 2008 · I get a message from the System Administrator, saying "554 Authentication Failed, must login" This started about Oct. 15, and I switched to Thunderbird as a mail client, and thought the upgrade to 2007 would siolve the problem, but it has not. I have no problems in Thunderbird, but I perfer using Outlook. Any ideas as to
    Status:Online

Outlook not working properly. 554 Authentication Failed ...

    http://www.geekstogo.com/forum/topic/308771-outlook-not-working-properly-554-authentication-failed-must-login/
    Oct 10, 2011 · Outlook not working properly. 554 Authentication Failed, must login - posted in Web Browsers and Email: Hi I have just registered here & I'm hoping someone might be able to help me. I am using office outlook 2003 & it has just stopped sending mail. I can receive email no problem but when I try to send I receive the message as shown below (with recipient email address in the brackets) Your ...
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SMTP Code: "554 5.7.1" and the message is rejected

    https://support.symantec.com/us/en/article.tech169847.html
    Sep 23, 2019 · SMTP code "554 5.7.1" is a rejection from the Recipient Domain. SMTP code "554 5.7.1" means 'Not allowed'. The address in 'Mail From' appears to have insufficient submission rights, or is invalid, or is not authorized with the authentication used; the address in an RCPT TO command is inconsistent with the permissions given to the user; the message data is rejected based on the …
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error 554 authentication failed, must login - narkive

    http://microsoft.public.outlook.general.narkive.com/jqLOKjtg/error-554-authentication-failed-must-login
    "554 Authentication Failed, must login" This started about Oct. 15, and I switched to Thunderbird as a mail client, and thought the upgrade to 2007 would siolve the problem, but it has not. I have no problems in Thunderbird, but I perfer using Outlook.
    Status:Online

setting up outgoing email server Email Questions

    https://www.emailquestions.com/threads/setting-up-outgoing-email-server.12294/
    Feb 12, 2016 · setting up outgoing email server. Discussion in 'Help Desk ... Fwd: ' Server Error: 554 Server Response: 554 5.7.1 [R8] Authentication Failed, must login. Server: 'smtp.hughes.net' Windows ... Joined: Feb 2, 2016 Messages: 33 Likes Received: 4. That means you need to check the "Outgoing Server Requires Authentication" setting in in Windows Live ...
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Cannot send email using Outlook: 554 5.7.1: Client host ...

    https://support.plesk.com/hc/en-us/articles/213364749-Cannot-send-email-using-Outlook-554-5-7-1-Client-host-rejected-Access-denied-
    Mail server rejects all incoming emails: Client host rejected: Access denied; An IP address of a Plesk mail server got blacklisted. How to troubleshoot? How to update ionCube Loader to the latest version for PHP 5.6, 7.0, 7.1 or 7.2 shipped by Plesk? Spamassassin failed to run SPF_NONE test
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