On Thu, May 14, 2020 at 07:48:27AM +0200, Matus UHLAR - fantomas wrote: > Can't that be kind of sender verification where the SMTP client doesn't > cleanly close TLS connection? > > shouldn't we focus on failed client connections? [No we should not]
Would I be wasting my time and the OP's chasing bugs in low-level internals if it could be that simple? Please avoid unproductive speculation that's not consistent with the symptoms. Don't just guess, your hypothesis is ruled out by the packet traces, and the OpenSSL errors on SSL_read() purporting incorrect use of the SSL_shutdown() function on the server (local) side. -- Viktor.