2013年1月22日 · However, if the mail server doesn't support STARTTLS the connection doesn't fail. Thunderbird continues to use a normal connection. This is a security risk since …

2016年6月1日 · The telnet client will not negotiate a TLS session for you. You should use another tool, such as OpenSSL's s_client. The following issues the STARTTLS command for you and …

2018年12月14日 · Send-Mailmessage : The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS …

explicitly calling .starttls() on smtp servers supporting it with a malicious MitM stripping your STARTTLS command and forging a non 220 response will NOT negotiate ssl, nor raise an …

2015年9月19日 · openssl s_client -starttls smtp -4 -connect smtp.server.no:587 -crlf -ign_eof -4 can be needed to force IPv4. If from command line on Windows, one should not use the -crlf …

2015年7月22日 · The Connect() method that you are using only allows enabling/disabling SSL-wrapped connections which is not the same thing as StartTLS. Due to the confusion, I've …

2011年10月11日 · smtp.gmail.com forces you to use an encrypted connection using STARTTLS. Indy 9 does not support STARTTLS directly, but indy 10 does. In Indy 10, before connecting to …

2012年5月9日 · So try to set it (boolean) true like props.put("mail.smtp.starttls.enable", true); or if its dynamic then make sure your variable is boolean or if its String then db value should be set …

2012年10月15日 · After receiving a 220 response to a STARTTLS command, the client SHOULD start the TLS negotiation before giving any other SMTP commands. and. 5.2 Result of the …

2016年4月20日 · In this mode, the SMTP session begins on an unencrypted channel, then a STARTTLS command is issued by the client to the server to switch to secure communication …