18 Dec
2023
18 Dec
'23
10:16 a.m.
On 12/17/23 12:39, Mike Spooner wrote:
Hi,
Port 465 is typically for implicit-SSL, whereas port 587 is for explicit-SSL (ie: requires the client to issue a STARTTLS command after connecting).
I'm not sure exactly what stunnel config changes are needed to deal with that different protocol, but that is where you shoukd start looking.
"protocol = smtp" needs to be added to the stunnel.conf section in order to enable the explicit (STARTTLS) SMTP negotiation.
Best regards, Mike