An error occurred while attempting to establish an SSL or TLS connection while sending email

jayc wrote:

Thank you Jayc, your suggestions on SSL (Unchecked) and Use default credentials (Unchecked) worked on Office 365.

Are you getting emails from Contact Us form? We are getting 'SendAsDeniedException.MapiExceptionSendAsDenied' error.

Thank you,
Anup

anupkum wrote:

Mines OK. Check that your nop email account matches the email from address on your contact us form.

So, as written earlier if you have unchecked the SSL setting then nopCommerce will use TLS secure socket where possible. Also, an important note: by default for new Office 365 tenants, SMTP Auth is disabled. You can try to enable it in the Admin Portal or through the PowerShell tool:
https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/authenticated-client-smtp-submission#use-the-microsoft-365-admin-center-to-enable-or-disable-smtp-auth-on-specific-mailboxes

Perhaps the description should be changed to reflect better how it works.

"Use SSL protocol only" may be a better name

So, I'm having the same issue with the nop 3.4:
I'm trying to use gmail as my email account with the following configuration:
host: smtp.gmail.com
port:587
SSL- checked
Use default credentials - unchecked.
And it does not work - Can you please help me with that?
Any help is most welcome!

Lior.


An error occurred while attempting to establish an SSL or TLS connection. This usually means that the SSL certificate presented by the server is not trusted by the system for one or more of the following reasons: 1. The server is using a self-signed certificate which cannot be verified. 2. The local system is missing a Root or Intermediate certificate needed to verify the server's certificate. 3. A Certificate Authority CRL server for one or more of the certificates in the chain is temporarily unavailable. 4. The certificate presented by the server is expired or invalid. Another possibility is that you are trying to connect to a port which does not support SSL/TLS. It is also possible that the set of SSL/TLS protocols supported by the client and server do not match. See https://github.com/jstedfast/MailKit/blob/master/FAQ.md#SslHandshakeException for possible solutions.

@shamilal
Please don't duplicate topics.  Did you see what I replied your other post? Did you make adjustments in your gmail account?  (please reply in the other topic)
https://www.nopcommerce.com/en/boards/topic/90087/test-email-not-working#280452