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http://forums.mozillazine.org/viewtopic.php?f=39&t=496054
Dec 05, 2006 · Uncheck tools -> account settings -> server settings -> "use secure authentication". Perhaps you can enable SSL (secure connection) so that the password is not sent in the clear. I'm not aware of SMTP servers supporting secure authentication, they appear to only support secure …
https://www.justanswer.com/computer/357c3-mail-server-does-not-support-secure-authentication.html
Feb 14, 2010 · Comcast uses no authentication for outgoing mail. Use smtp.comcast.net for your outgoing mail w/no authentication. Use mail.comcast.net for your incoming mail w/your standard username and password. Choose to never use secure connection for this server.
https://support.microsoft.com/en-us/help/3183972/authentication-fails-when-you-use-an-imap-server-in-outlook-2016
May 20, 2019 · Authentication fails when you use an IMAP server in Outlook 2016. Content provided by Microsoft. ... You may be able to configure your email account to use POP3 instead of IMAP if your email server supports POP3 connections. ... If possible, use Outlook 2013 instead of Outlook 2016 to connect to your IMAP account. This issue does not occur in ...
https://www.howtoforge.com/community/threads/smtp-auth-failure-server-does-not-support-secure-authentication.6738/
Sep 12, 2006 · The main problem however, is that the remote mail client is told that the server does not support secure authentication, before I have a chance to send a password.
https://social.technet.microsoft.com/forums/exchange/en-US/c7f561c5-ae6d-4b9b-bcb2-b9a632d0f1f3/the-server-does-not-support-a-ssl-conncetion-mail-client-with-exchange-2010
Feb 17, 2011 · You can verify if the server will accept secure connections via telnet. telnet server 587 (where server is the name of your server). Then type. ehlo. A list of commands will be returned. One of them should be starttls:
https://answers.microsoft.com/en-us/mac/forum/macoffice2011-macoutlook/authentication-failed-because-outlook-doesnt/26d9c068-e1a9-4639-ab18-e01fa0a8031d
Jan 05, 2015 · Protect Yourself From Tech Support Scams Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number .
https://answers.microsoft.com/en-us/windowslive/forum/livemail-email/unable-to-send-server-error-250-0x00ccc7d/226c5c32-2a29-4381-9e5c-7e2d4c0712ab
Oct 12, 2014 · This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread.
https://stackoverflow.com/questions/38760055/server-does-not-support-secure-connections-in-c-sharp
it will return the error: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated. The server response was: 5.7.1 Client was not authenticated.
http://forums.mozillazine.org/viewtopic.php?f=28&t=1858105
Apr 19, 2010 · Authentication means sending your login name and password to log into the server. This proves to the server that you are entitled to use it to process your mail. If you attempt to authenticate on an SMTP server (i.e. when SENDING mail) that doesn't support it, such as on many cable systems,...
https://docs.microsoft.com/en-us/sql/integration-services/connection-manager/smtp-connection-manager
The SMTP connection manager supports only anonymous authentication and Windows Authentication. It does not support basic authentication. Specify whether to encrypt communication using Secure Sockets Layer (SSL) when sending e-mail messages. You can set properties through SSIS Designer or programmatically.
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