[stunnel-users] Re: Unexpected socket close while sending mail

Javier wrote:

Hi,

"protocol = smtp" on client service implies STARTTLS command and, so, implies response from server accordingly to start the TLS session.

Are you sure that strato.de servers offers plain text and TLS upon requests via STARTTLS?

Otherwise, remove the protocol line or comment out with a semicolon (;)

https://datatracker.ietf.org/doc/html/rfc2487

Regards.

Thanks!! that did it.

I had also to comment out protocol = pop3 to get POP working.

Moreover I commented out verifyChain = yes checkHost = ... as stunnel complained about the server certivicate. I still hope I will be able fix that somehow, but the essential is that mail is up again on that account.