我想发送电子邮件，但它给我一个错误。
我有这个代码：
Sub sendMail(ByVal title As String, ByVal content As String)
Dim SmtpServer As New SmtpClient("smtp.gmail.com", 25)
SmtpServer.Credentials = New Net.NetworkCredential("[email protected]", "password")
Dim mail As New MailMessage("[email protected]", "[email protected]", title, content)
SmtpServer.Send(mail)
End Sub
我有一个 try catch 尝试调用此方法，但它不起作用，因此 catch 运行并且我收到异常：
System.Net.Mail.SmtpException: 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. b6sm3176487lae.0 - gsmtpGmail 在端口 465 上使用基于 SSL 的 SMTP。
尝试做：
Dim SmtpServer As New SmtpClient("smtp.gmail.com", 465)
...
SmtpServer.EnableSsl = True
...
试试这个 - 我知道它有效。
Dim Mail As New MailMessage
Dim SMTP As New SmtpClient("smtp.gmail.com")
Mail.Subject = "Security Update"
Mail.From = New MailAddress("[email protected]")
SMTP.Credentials = New System.Net.NetworkCredential("[email protected]", "password") '<-- Password Here
Mail.To.Add(address & "@gmail.com") 'I used ByVal here for address
Mail.Body = "" 'Message Here
SMTP.EnableSsl = True
SMTP.Port = "587"
SMTP.Send(Mail)
Google帐户出现问题，您需要关闭一些安全设置。一遍又一遍地发送电子邮件后，我在我的一个支持帐户（针对谷歌）上收到了电子邮件，该电子邮件是：
You recently changed your security settings so that your Google Account [[email protected]] is no longer protected by modern security standards.
If you did not make this change
Please review your Account Activity page at https://security.google.com/settings/security/activity to see if anything looks suspicious. Whoever made the change knows your password; we recommend that you change it right away.
If you made this change
Please be aware that it is now easier for an attacker to break into your account. You can make your account safer again by undoing this change at https://www.google.com/settings/security/lesssecureapps then switching to apps made by Google such as Gmail to access your account.
Sincerely,
The Google Accounts team
所以我放弃了额外的安全措施，并且工作得很好。
将端口更改为587。端口25不支持SSL。
执行此操作的一个超级简单的方法（无需更改任何安全设置）是使用 IFTTT 和我的 IFTTT Maker.net libary
首先，在 IFTTT 中创建一个由 Maker 通道触发的新配方，并将事件命名为“send_gmail”。
然后，选择 Gmail 引擎并点击“发送电子邮件”，然后将“收件人”替换为“{{value1}}”，将主题替换为“{{value2}}”，将消息/正文替换为“{{value3}}”
之后，在 Visual Studio 中，将 ifttt.vb 添加到您的项目中。现在的代码：
Try
makechannel.scode = "your account ID"
makechannel.fireevent("send_gmail", "TO", "SUBJECT", "MESSAGE")
'code goes here if done
Catch ex As Exception
'code goes here if it fails
End Try
然后填写您的帐户ID。您可以在 ifttt.com/maker 找到它
就是这样！
我已经编写了可以轻松执行此任务的类。
Imports System.Net.Mail
Public Class GGSMTP_GMAIL
Dim Temp_GmailAccount As String
Dim Temp_GmailPassword As String
Dim Temp_SMTPSERVER As String
Dim Temp_ServerPort As Int32
Dim Temp_ErrorText As String = ""
Dim Temp_EnableSSl As Boolean = True
Public ReadOnly Property ErrorText() As String
Get
Return Temp_ErrorText
End Get
End Property
Public Property EnableSSL() As Boolean
Get
Return Temp_EnableSSl
End Get
Set(ByVal value As Boolean)
Temp_EnableSSl = value
End Set
End Property
Public Property GmailAccount() As String
Get
Return Temp_GmailAccount
End Get
Set(ByVal value As String)
Temp_GmailAccount = value
End Set
End Property
Public Property GmailPassword() As String
Get
Return Temp_GmailPassword
End Get
Set(ByVal value As String)
Temp_GmailPassword = value
End Set
End Property
Public Property SMTPSERVER() As String
Get
Return Temp_SMTPSERVER
End Get
Set(ByVal value As String)
Temp_SMTPSERVER = value
End Set
End Property
Public Property ServerPort() As Int32
Get
Return Temp_ServerPort
End Get
Set(ByVal value As Int32)
Temp_ServerPort = value
End Set
End Property
Public Sub New(ByVal GmailAccount As String, ByVal GmailPassword As String, Optional ByVal SMTPSERVER As String = "smtp.gmail.com", Optional ByVal ServerPort As Int32 = 587, Optional ByVal EnableSSl As Boolean = True)
Temp_GmailAccount = GmailAccount
Temp_GmailPassword = GmailPassword
Temp_SMTPSERVER = SMTPSERVER
Temp_ServerPort = ServerPort
Temp_EnableSSl = EnableSSl
End Sub
Public Function SendMail(ByVal ToAddressies As String(), ByVal Subject As String, ByVal BodyText As String, Optional ByVal AttachedFiles As String() = Nothing) As Boolean
Temp_ErrorText = ""
Dim Mail As New MailMessage
Dim SMTP As New SmtpClient(Temp_SMTPSERVER)
Mail.Subject = Subject
Mail.From = New MailAddress(Temp_GmailAccount)
SMTP.Credentials = New System.Net.NetworkCredential(Temp_GmailAccount, Temp_GmailPassword) '<-- Password Here
Mail.To.Clear()
For i As Int16 = 0 To ToAddressies.Length - 1
Mail.To.Add(ToAddressies(i))
Next i
Mail.Body = BodyText
Mail.Attachments.Clear()
If AttachedFiles IsNot Nothing Then
For i As Int16 = 0 To AttachedFiles.Length - 1
Mail.Attachments.Add(New Attachment(AttachedFiles(i)))
Next
End If
SMTP.EnableSsl = Temp_EnableSSl
SMTP.Port = Temp_ServerPort
Try
SMTP.Send(Mail)
Return True
Catch ex As Exception
Me.Temp_ErrorText = ex.Message.ToString
Return False
End Try
End Function
End Class
就是这样，如何使用class：
Dim GGmail As New GGSMTP_GMAIL("[email protected]", "AccPassword", )
Dim ToAddressies As String() = {"[email protected]", "[email protected]"}
Dim attachs() As String = {"d:\temp_Excell226.xlsx", "d:\temp_Excell224.xlsx", "d:\temp_Excell225.xlsx"}
Dim subject As String = "My TestSubject"
Dim body As String = "My text goes here ...."
Dim result As Boolean = GGmail.SendMail(ToAddressies, subject, body, attachs)
If result Then
MsgBox("mails sended successfully", MsgBoxStyle.Information)
Else
MsgBox(GGmail.ErrorText, MsgBoxStyle.Critical)
End If
希望这有帮助。良好的编码
我得到了
SMTP 服务器需要安全连接，或者客户端未经过身份验证。服务器响应是：5.7.0 需要身份验证。欲了解更多信息，请访问“}
使用上面的代码
你能帮忙吗？