SZÉPE Viktor writes:
6) telnet email-smtp.us-west-2.amazonaws.com 587 220 email-smtp.amazonaws.com ESMTP SimpleEmailService-1868680227 MmKC14V2dPS1oRPRtSjFCourier says: /SECURITY=REQUIRED set, but TLS is not available Could it be that Courier compares the SMTP banner (email-smtp.amazonaws.com) to the certificate CN, not the specified host name (email-smtp.us-west-2.amazonaws.com) ?
Looks like that server uses a self-signed certificate, and if it's not added to your trusted certificate store, TLS negotiation will fail.
You would think that Amazon has the resources to pay itself a few bucks each year, for a properly signed certificate.
You'll have to reset TLS_VERIFYPEER to NONE, in the esmtpd-ssl config file.
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