Hey,
thank you for your reply.
> My first guess ist that the chain is not correct and so the server's
> certificate cannot be validated.
you are correct about it. I read the openssl output wrong, i got
confused by "Verify return code: 0 (ok)" and thought the connection was
successful. But is was not.
> If you are sure that your PHP script connects to the right host then you
> can remove temporarily validation just to see if this will work. If so
> you should enable validation again and examine the chain on your
> mailserver.
Yeah, i think this is (to my surprise) not a PHP issue.
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