sendmail[23425]: STARTTLS=server, error: accept failed=0, SSL_error=1, errno=0, retry=-1, relay=m68-112.mailgun.net [166.78.68.112]
sendmail[76688]: STARTTLS: write error=syscall error (-1), errno=104, get_error=error:00000000:lib(0):func(0):reason(0), retry=99, ssl_err=5
2. I assume that in the smtp standard the option to fallback to the
plain connection is still mandatory?
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