IIS 5 & IIS 6
Warning: The remote SMTP service does not support TLS.
Last post Jul 17, 2019 07:15 AM by Jalpa Panchal
Jul 10, 2019 12:24 PM|Quim|LINK
in the Event Viewer of the IIS server I find Warnings of the type:
"Message delivery to the host 'XXX.XXX.XXX.XXX' failed while delivering to the remote domain 'xxxx ****.' for the following reason: The remote SMTP service does not support TLS.The SMTP verb which caused the error is 'STARTTLS'. "
Configuration of the Virtual Servers of the IIS is correct, I think, but some domains do not reach the mails.
Jul 11, 2019 05:51 AM|Jalpa Panchal|LINK
To resolve this issue you could try below steps:
Open iis server select smtp->Properties of the SMTP virtual server, Access tab, Authentication
button, uncheck "requires TLS encryption"
Go to the delivery tab->select outbound security->uncheck the "tls encryption"
Restart the SMTP server after doing changes.
If still, it is failing than enable logging of the SMTP server.
Jul 15, 2019 01:50 PM|Quim|LINK
if another domains need TLS encryption and I unchecked in Outbound Security, what will occur?
We should send in two cases.
Jul 17, 2019 07:15 AM|Jalpa Panchal|LINK
To disable tls for only one domain you can select the domain name from the iis->right click on domain name->select properties.
than select outbound security.in outbound security uncheck the TLS encryption.