On Fri, Oct 20, 2017 at 07:01:04AM +0200, Ben Stover wrote: > In stunnels *.conf file I can specify the mail server name and the port for a > connection. > > How can I tell stunnel to use STARTTLS as connect type? > How can I tell stunnel to use SSL/TLS as connect type? > > Does stunnel support both connect types at all or only one? > > Is the connect type for SMTP completely determined by port e.g.: > > STARTTLS over port 587 and SSL/TLS over port 465 > or can both connect types use both ports?
Take a look at the excellent stunnel documentation (hint: "protocol"). > Assume I do not get the supported connect type information from my webhoster: This is highly unlikely; how else are you supposed to configure your e-mail client? (assuming you are trying to setup a tunnel to your provider's e-mail server) > How can I find it out from my (client) side? Still, there is a way: if you have somehow managed to guess the correct hostname and port to connect to, you can use "nc -v" or "telnet". If the port is 25, or if the server greets you with an SMTP banner (usually "220 something" or "220-something"), then this is a cleartext connection and you want to set up STARTTLS (you can test for it by issuing a couple of SMTP commands and then trying STARTTLS). If the server just hangs there and waits for you to send something, then it's probably a TLS connection; you can test for that by running: openssl s_client -connect hostname:port Still, I do indeed find it highly unlikely that your hosting provider will not have given you enough information. > What are there error messages? Not sure what this question refers to. G'luck, Peter -- Peter Pentchev [email protected] [email protected] [email protected] PGP key: http://people.FreeBSD.org/~roam/roam.key.asc Key fingerprint 2EE7 A7A5 17FC 124C F115 C354 651E EFB0 2527 DF13
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