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2023年3月28日 · The server response was: 5.7.0 Must issue a STARTTLS command first. ... System.Net.Mail.SmtpException: The SMTP server requires a secure ...
2019年3月25日 · Loading. Hi, I'm getting error while sending email: System.Net.Mail ... The server response was: 5.7.0 Must issue a STARTTLS command first.
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.0 Must issue a STARTTLS command first.
The server response was: 5.7.0 Must issue a STARTTLS command first. mz11sm1377223qcb.39 at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, ...
2022年8月30日 · System.Net.Mail.SmtpException: The SMTP server requires a secure ... The server response was: 5.7.0 Must issue a STARTTLS command first.
2011年10月18日 · The server response was: 5.7.0 Must issue a STARTTLS command first. jm5sm6473157pbc.1.
... System.Net.Mail.SmtpException - Message could not be sent. System.Net.Sockets ... The server response was: 5.7.0 Must issue a STARTTLS command first.
System.Net.Mail.SmtpException: The SMTP server requires a secure connection or the ... The server response was: 5.7.0 Must issue a STARTTLS command first.