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http://www.kb.lesolson.com/InstantKB2016/KnowledgebaseArticle50515.aspx
GMAIL SMTP Server that does NOT require SSL or Authentication; GMAIL SMTP Server that does NOT require SSL or Authentication. 6 Years Ago Rob Bussell E-Mail. February 12, 2013 ... If your device or application does not support SSL, connect to aspmx.L.google.com on port 25.
https://www.drupal.org/project/smtp/issues/2080923
Sep 03, 2013 · 1. Login with your gmail account and find "Allow less secure apps:" from here. 2. Google manages security with your gmail account. You need to turn on "Allow less secure apps:" and you will receive mail in your gmail account. Let me know if you face any query/concern regarding this. Thanks!
http://forums.mozillazine.org/viewtopic.php?f=28&t=1858105
Apr 19, 2010 · It does not support authentication (SMTP-AUTH) but you have chosen to use authentication. Uncheck 'Use name and password' for that server or contact your service provider." Because I had deleted and set up the account again, I immediately suspected that I had an option set up that the ISP couldn't handle.
https://support.google.com/a/answer/176600?hl=en
This article is for G Suite administrators. If you're not an admin and you're trying to send an email from a device or app, ask your G Suite admin for help. You can set up your on-premises printer, scanner, fax, or app to send email through G Suite using: G Suite SMTP relay service (recommended) Gmail SMTP server; Restricted Gmail SMTP server
http://www.networksolutions.com/support/how-do-i-enable-smtp-authentication/
Ensure that the box next to "My outgoing server (SMTP) requires authentication" is checked. Click the "Advanced" tab and make sure that you have not selected "This server requires a secure connection (SSL)" under the incoming (POP3) or outgoing (SMTP) port settings.Ougoing server port is 587; Back to Top . Outlook® 2000 and Outlook® 98 (PC)
https://www.howtoforge.com/community/threads/smtp-auth-failure-server-does-not-support-secure-authentication.6738/
Sep 12, 2006 · Just for fun, I specified mynetworks_style = host, and authentication from my lan (on the same subnet) failed. So, I guess it isn't authenticating at all, but was allowing relaying because the machines are on the same sbunet. And nothing at all is added to the log when I get the message "Mail server does not support secure authentication".
https://www.authsmtp.com/gmail/
Are you having a problem sending email or looking for a reliable SMTP server? AuthSMTP is the outgoing SMTP email service for your e-commerce website, mailing list or email program.. It works on most current computers or devices and solves many of the common problems with sending email such as relaying denied errors or blacklisting issues.. With instant setup, a money back guarantee and very ...
https://www.3cx.com/community/threads/the-smtp-server-does-not-support-authentication.58684/
Aug 17, 2018 · I could not make it work again, so I tried to fall back to the 3CX SMTP server, but this gives the same error: "The SMTP server does not support authentication." even as Outlook.com and Gmail (also tried as Custom SMTP server). After all my tests I restarted the 3CX services (and sometimes a reboot of the machine)
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