this is my code it was running without errors but suddenly
an exception appears
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required.
Dim smtpserver As New SmtpClient()
Dim mail As New MailMessage()
smtpserver.Credentials = New Net.NetworkCredential("myemail#gmail.com", "mypass")
smtpserver.Host = "smtp.gmail.com"
smtpserver.Port = "587"
mail = New MailMessage
mail.From = New MailAddress("myHouseHQ#gmail.com")
mail.To.Add(Form2.TextBox1.Text)
mail.Subject = "EagleEyes"
mail.Body = "EagleEyes has detected a movement!"
If emailphoto Then
Dim attach As New Attachment("D:\hi" & sm & ".jpg")
mail.Attachments.Add(attach)
End If
smtpserver.EnableSsl = True
smtpserver.UseDefaultCredentials = False
' Try1
smtpserver.Send(mail)
'Catch ex As SmtpException
'MsgBox("Error Connection!" & ex.Message)
'End Try
sm += 1
Don't use "" by the port.
Please try this for the port:
smtpserver.Port = 587
Related
I'm trying to send emails automatically, the configuration below worked perfectly with Gmail, but now with office365. I can't send the emails, I need help.
Try
Dim SmtpServer As New SmtpClient()
Dim mail As New MailMessage()
SmtpServer.UseDefaultCredentials = False
SmtpServer.Credentials = New Net.NetworkCredential("xxx#xx.com", "xxxx")
SmtpServer.Port = 587
SmtpServer.Host = "smtp.office365.com"
SmtpServer.EnableSsl = True
SmtpServer.DeliveryMethod = SmtpDeliveryMethod.Network
mail = New MailMessage()
mail.From = New MailAddress("xxx#xx.com")
mail.To.Add(listaCorreo)
mail.Subject = " string "
mail.Body = "string "
mail.IsBodyHtml = True
SmtpServer.Send(mail)
Catch ex As Exception
Console.ForegroundColor = ConsoleColor.Red
Console.WriteLine("Class -\> ClassProcessingError, Method -\> MyContactByMail, Error -\> " & ex.Message)
End Try
the error is 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. t77sm26908892pfg.102 - gsmtp
Dim SmtpServer As New SmtpClient()
Dim mail As New MailMessage()
SmtpServer.Port = 587
SmtpServer.Host = "smtp.gmail.com"
SmtpServer.Credentials = New _
Net.NetworkCredential("user#gmail.com", "user1")
mail = New MailMessage()
mail.From = New MailAddress("user#gmail.com")
mail.To.Add("user2#gmail.com")
mail.Subject = "Test Mail"
mail.Body = "This is for testing SMTP mail from GMAIL"
SmtpServer.Send(mail)
MsgBox("mail send")
As Codexer said in his comment, you are not enabling SSL by setting SmtpServer.EnableSsl = True
Dim SmtpServer As New SmtpClient()
Dim mail As New MailMessage()
SmtpServer.Port = 587
SmtpServer.EnableSsl = True ' <---- this
SmtpServer.Host = "smtp.gmail.com"
SmtpServer.Credentials = New _
Net.NetworkCredential("user#gmail.com", "user1")
mail = New MailMessage()
mail.From = New MailAddress("user#gmail.com")
mail.To.Add("user2#gmail.com")
mail.Subject = "Test Mail"
mail.Body = "This is for testing SMTP mail from GMAIL"
SmtpServer.Send(mail)
MsgBox("mail send")
It always a good idea to not send your credentials as plain text over the internet...
I have tried different port numbers but I keep getting the error message and no email sent. I aim to be able to send the email successfully and the message will contain details from an appointment booked. Any help please?
Dim UserName As String = "example#gmail.com"
Dim mail As MailMessage = New MailMessage
mail.From = New MailAddress(UserName)
mail.To.Add(New MailAddress(txtEmailAddress.Text))
mail.Subject = "Appointment Details"
mail.Body = "Test message"
mail.IsBodyHtml = True
Dim client As SmtpClient = New SmtpClient("smtp.gmail.com", 465)
client.EnableSsl = True
client.Credentials = New System.Net.NetworkCredential(UserName, "***")
Try
client.Send(mail)
Catch ex As Exception
MessageBox.Show("Sending email failed. Please Try again")
End Try
What you need to do is add client.UseDefaultCredentials = False, but make sure you set it to false before calling client.Credentials = New System.Net.NetworkCredential(UserName, "***")
Also, for GMail, you need to use port 587 which is the port that supports the STARTTLS extension (which is the only way that System.Net.Mail.SmtpClient supports SSL).
In other words, change your code to this:
Dim UserName As String = "example#gmail.com"
Dim mail As MailMessage = New MailMessage
mail.From = New MailAddress(UserName)
mail.To.Add(New MailAddress(txtEmailAddress.Text))
mail.Subject = "Appointment Details"
mail.Body = "Test message"
mail.IsBodyHtml = True
Dim client As SmtpClient = New SmtpClient("smtp.gmail.com", 587)
client.EnableSsl = True
client.UseDefaultCredentials = False
client.Credentials = New System.Net.NetworkCredential(UserName, "***")
Try
client.Send(mail)
Catch ex As Exception
MessageBox.Show("Sending email failed. Please Try again")
End Try
Try this,
go to your gmail account (www.gmail.com)
login, and check that you have "enabled Pop for all mail".
you can find this under the tab "Forwarding and POP/IMAP"
Also try switching the port number to 587
Here's my code (yes I censored my email/password) (when you click button)
Dim Mail As New MailMessage
Mail.Subject = "test email"
Mail.To.Add("*****")
Mail.From = New MailAddress("*****") '
Mail.Body = "This is an email!"
Dim SMTP As New SmtpClient("smtp.gmail.com")
SMTP.EnableSsl = True
SMTP.Credentials = New System.Net.NetworkCredential("*****", "*****")
SMTP.Port = 587
SMTP.Send(Mail)
MsgBox("Sent Successfully")
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at (link which doesn't help)
SOLVED!
I never would have guessed.
Google wasn't letting me use my account because it was hacked. It apparently was hacked when I was writing code...
FYI, a safer version would be
Using mail As MailMessage = New MailMessage
mail.Subject = "test email"
mail.To.Add("*****")
mail.From = New MailAddress("*****") '
mail.Body = "This is an email!"
Using smtp As New SmtpClient("smtp.gmail.com")
smtp.EnableSsl = True
smtp.Credentials = New System.Net.NetworkCredential("*****", "*****")
smtp.Port = 587
smtp.Send(mail)
End Using
End Using
MsgBox("Sent Successfully")
This would ensure that the mail and smtp objects get cleaned up, whether or not an exception occurs.
This is my code to send email using GMAIL and VB.NET:
Try
Dim SmtpServer As New SmtpClient()
SmtpServer.Credentials = New Net.NetworkCredential("mygmailid#gmail.com", "mypassword")
SmtpServer.Port = 587
SmtpServer.Host = "smtp.gmail.com"
SmtpServer.EnableSsl = True
mail = New MailMessage()
mail.From = New MailAddress("mygmailid#gmail.com", "Asked for help", System.Text.Encoding.UTF8)
Mail.To.Add("sendtoemail#id")
Mail.Subject = "A help query has been raised"
mail.Body = frm_dashboard.user_data_fetch.Item(1, 0).Value.ToString + " " + ask_for_help.txt_message_ask_help.Text
SmtpServer.Send(Mail)
MessageBox.Show("Mail sent")
Catch ex As Exception
MsgBox(ex.ToString())
MessageBox.Show("Oops something went wrong.")
End Try
But this shows me this error:-
This is the order I have it in, you might want to try this:
Dim SMTP As New SmtpClient("smtp.gmail.com")
SMTP.Credentials = New System.Net.NetworkCredential("gmailID", "password")
SMTP.EnableSsl = True
SMTP.Port = "587"
SMTP.Send(Mail)
Also note that I don't actually use the "#gmail.com" when passing in my credentials.