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https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_dep365-mso_o365b/smtp-server-doesnt-support-starttls/3bf73694-75f4-49e6-9bb8-baa8132677e5
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http://forums.msexchange.org/unable_to_support_the_STARTTLS_SMTP_verb_for_the_connector/m_1800479634/tm.htm
Jul 10, 2008 · Therefore, it is unable to support the STARTTLS SMTP verb for the connector SMTP with a FQDN parameter of mail.*****.com. If the connector's FQDN is not specified, the computer's FQDN is used. Verify the connector configuration and the installed certificates to make sure that there is a certificate with a domain name for that FQDN.
https://blogs.blackmarble.co.uk/adawson/2016/03/02/exchange-2013-cert-change-unable-to-support-the-starttls-smtp-verb/
Exchange 2013 Cert Change – Unable to Support the STARTTLS SMTP Verb. I saw a issue recently on an Exchange server after the certificate used to secure SMTP and IIS services was changed as the old certificate was about to expire.
https://community.spiceworks.com/topic/391758-exchange-certificate-problem
Oct 08, 2013 · Microsoft Exchange could not find a certificate that contains the domain name EXCHANGE.internal.co.uk in the personal store on the local computer. Therefore, it is unable to support the STARTTLS SMTP verb for the connector Default Exchange with a FQDN parameter of EXCHANGE.internal.co.uk.
https://community.spiceworks.com/windows_event/show/151-msexchangetransport-12014
Microsoft Exchange could not find a certificate that contains the domain name server.domain in the personal store on the local computer. Therefore, it is unable to support the STARTTLS SMTP verb for the connector Default server with a FQDN parameter of server.domain If the connector's FQDN is not specified, the computer's FQDN is used.
https://blog.wapnet.nl/2012/02/fix-starttls-smtp-error/
Therefore, it is unable to support the STARTTLS SMTP verb for the connector Outbound Ex 2010 with a FQDN parameter of exchange.global-e.nl. If the connector’s FQDN is not specified, the computer’s FQDN is used. Verify the connector configuration and the installed certificates to make sure that there is a certificate with a domain name for ...
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_dep365/smtp-server-doesnt-support-starttls/3bf73694-75f4-49e6-9bb8-baa8132677e5
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 …
https://stackoverflow.com/questions/17281669/using-smtp-gmail-and-starttls
First of all, it looks like you're using the wrong port. Gmail exposes port 465 for SMTP over SSL and port 587 for SMTP with STARTTLS, as documented here.The difference between these two is that SMTP over SSL first establishes a secure SSL/TLS connection and conducts SMTP over that connection, and SMTP with STARTTLS starts with unencrypted SMTP and then switches to SSL/TLS.
https://www.ibm.com/support/knowledgecenter/en/SSKTMJ_9.0.1/admin/conf_securingsmtpsessionsusingthestarttlsextension_c.html
Securing SMTP sessions using the STARTTLS extension. ... In a negotiated SSL scheme, the sending and receiving hosts each use the SMTP STARTTLS extension, defined in RFC 2487, to signal their readiness to negotiate an SSL connection. ... To enable outbound STARTTLS support, set the SMTP outbound TCP/IP port status to: Negotiated SSL.
https://support.mozilla.org/en-US/questions/1139063
Sep 14, 2016 · Support Forum. Search. ... Unable to establish a secure link with Outgoing server (SMTP) smtp.ntlworld.com using STARTTLS since it doesn't advertise that feature. Switch off STARTTLS for that server or contact your service provider." Any thoughts how I 'switch off STARTTLS'?
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