On Thu, Nov 12, 2020, Paul de Weerd wrote: > $ openssl s_client -starttls smtp -connect localhost:587
> RCPT TO: <we...@weirdnet.nl> ^ = RENEGOTIATING and the syntax is wrong too: NO space after colon, see the fine RFCs. openssl(1): When used interactively (which means neither -quiet nor -ign_eof have been given), the session will be renegotiated if the line begins with an R; if the line begins with a Q or if end of file is reached, the connection will be closed down. Use rcpt to:<we...@weirdnet.nl> -- Address is valid for this mailing list only, please do not reply to it direcly, but to the list.