email - Using SMTP, Gmail, and STARTTLS - Stack Overflow
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 …
Why does Send-MailMessage fail to send using STARTTLS over …
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 …
SMTP STARTTLS certificate negotitiation via telnet
2014年11月20日 · openssl s_client -debug -starttls smtp -crlf -connect localhost:25 OpenSSL will do the STARTTLS handshake for you and you will be able to pick up the conversation from …
c# - Mailkit SMTP - StartTLS & TLS flags - Stack Overflow
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 …
Telnet smtp.mail - must issue STARTTLS command first
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 …
java - Must issue a STARTTLS command first - Stack Overflow
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 …
.net - Does System.Net.Mail.SmtpClient use SSL, TLS, StartTLS, or a ...
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 …
java - Using JavaMail with TLS - Stack Overflow
If you forget props.put("mail.smtp.starttls.enable","true") you get com.sun.mail.smtp.SMTPSendFailedException: 451 5.7.3 STARTTLS is required to send mail. …
java - JavaMail smtp properties (for STARTTLS) - Stack Overflow
JavaMail specifies a bunch of properties that can be set to configure an SMTP connection. To use STARTTLS it is necessary to set the following property. mail.smtp.starttls.enable=true Where …
STARTTLS error while sending email using Indy in Delphi XE
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 …