I have an application that worked perfectly until this Saturday.
Every time I try send an email I receive the error "ExtendedSocketException: Connection refused [::ffff:xxx.xxx.xxx.xxxx]:25".
I tried with 465 port but no solve the problem and it's show the error IOException: Unable to read data from the transport connection: The connection was closed.
The account email that I use in this app I use in my smartphone too and yesterday the I lost the connection with server. I contacted my provider and after remove the account and configured its started working again.
In the app I have this code
SmtpClient smtp = new SmtpClient("mail.yyyy.com", 465);
smtp.EnableSsl = true;
smtp.Credentials = new NetworkCredential("noreply#yyyy.com", "xxxxx");
MailAddress from = new MailAddress("noreply#yyyy.com", "yyyy - NoReply");
MailAddress to = new MailAddress(mail);
MailMessage mailMessage = new MailMessage(from, to);
mailMessage.Subject = subject;
mailMessage.IsBodyHtml = true;
reader = new StreamReader("wwwroot/templates/emails/comment-company.htm");
body = reader.ReadToEnd();
body = body.Replace("{url}", url);
body = body.Replace("{company}", name);
mailMessage.Body = body;
smtp.Send(mailMessage);
Anyone have an idea what I can do to solve this?
Try port 587 instead of 465. Port 465 is technically deprecated.
Related
I'm developing a third-party add-on to run in a program called M-Files.
The purpose of the add-on is to send a mail with the help of an SMTP server. I created a fake SMTP server in DevelMail.com just for testing.
Testing the SMTP server from a browser works but when i run the code it gives me the following error.
Transaction failed. The server response was: 5.7.1 Client host rejected: Access denied
Here are the SMTP information:
Host: smtp.develmail.com
SMTP Port: 25
TLS/SSL Port: 465
STARTTLS Port : 587
Auth types: LOGIN, CRAM-MD5
Here is the code:
MailAddress adressFrom = new MailAddress("notification#mfiles.no", "M-Files Notification Add-on");
MailAddress adressTo = new MailAddress("majdnakhleh#live.no");
MailMessage message = new MailMessage(adressFrom, adressTo);
message.Subject = "M-Files Add-on running";
string htmlString = #"<html>
<body>
<p> Dear customer</p>
<p> This is a notification sent to you by using a mailadress written in a metadata property!.</p>
<p> Sincerely,<br>- M-Files</br></p>
</body>
</html>
";
message.Body = htmlString;
SmtpClient client = new SmtpClient();
client.Host = "smtp.develmail.com";
client.Port = 587;
client.Credentials = new System.Net.NetworkCredential("myUserName", "myPassword");
client.EnableSsl = true;
client.Send(message);
Reason for the Issue:
Usually, email sending option using SMTP encountered Access denied
because there should have a sender email which required to allow
remote access. When SMTP request sent from the sender email
it checks whether there is remote access allowed. If no, then you
always got Access denied message.
Solution:
For example let's say, you want to send email using Gmail SMTP in that case you do have to enable Allow less secure apps: ON
How To Set
You can simply browse this link Less secure app access and turn that to ON
See the screen shot
Code Snippet:
public static object SendMail(string fromEmail, string toEmail, string mailSubject, string mailBody, string senderName, string senderPass, string attacmmentLocationPath)
{
try
{
MailMessage mail = new MailMessage();
//Must be change before using other than gmail smtp
SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
mail.From = new MailAddress(fromEmail);
mail.To.Add(toEmail);
mail.Subject = mailSubject;
mail.Body = mailBody;
mail.IsBodyHtml = true;
SmtpServer.Port = 587;
SmtpServer.Credentials = new System.Net.NetworkCredential(senderName, senderPass);//Enter the credentails from you have configured earlier
SmtpServer.EnableSsl = true;
SmtpServer.Send(mail);
return true;
}
catch (Exception ex)
{
return ex;
}
}
Note: Make sure, fromEmail and (senderName, senderPass) should be same email with the credential.
Hope that would help.
I need to send email from my site by SMTP protocol.
My program code works fine if I set email sender as gmail email, but when I put my hosting configuration as a sender it doesn't work.
I get this response:
"A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 162.249.5.6:25"
My code is below.
SmtpClient smtpClient = new SmtpClient("segrad-center.com", 25);
smtpClient.Credentials = new System.Net.NetworkCredential()
{
UserName = "test#segrad-center.com",
Password = "123456789segrad"
};
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.EnableSsl = false;
MailMessage mailMessage = new MailMessage("test#segrad-center.com", "khalilyehia12#gmail.com");
mailMessage.Subject = "test";
mailMessage.Body = "a2hostiong";
smtpClient.Send(mailMessage);
You can test this email by this link :
https://webmail.segrad-center.com/Mondo/lang/sys/client.aspx?CDT=43435.7142577315
Now the code work fine.
I've to upload my project to a2hosting server because I'm using a2hosting server as an email hosting, now everything work fine
below is the code
MailMessage message = new MailMessage();
message.From = new MailAddress("test#myDomain.com", "display name");
message.To.Add(email);
message.Body = "somebody please kill the developer";
message.Subject = subject;
SmtpClient client = new SmtpClient("mail.myDomain.com");
client.UseDefaultCredentials = false;
client.Credentials = new NetworkCredential("email#myDomain.com","myPassword");
client.EnableSsl = False;
client.Port = port;
client.Send(message);
1st test in my local network - success
2nd test application run at
azure server ~ application setting the same as 1st test - Got HELO error
ping and telnet from azure server is working, already double check the ip and port
Regards
Just a mediocore developer
Seems your username & password is not authenticating successfully with your SMTP server. Please check it again.
I'm trying to send an email via .net smtp. I am receiving this message:
The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated
MailMessage mail = new MailMessage();
SmtpClient SmtpServer = new SmtpClient("server", 587);
SmtpServer.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
SmtpServer.UseDefaultCredentials = false;
SmtpServer.EnableSsl = false;
SmtpServer.Credentials = new System.Net.NetworkCredential("username", "password");
mail.From = new MailAddress(FromMail);
mail.To.Add("emailaddress");
mail.Bcc.Add("emailaddress");
mail.Subject = subject;
mail.Body = body;
mail.IsBodyHtml = true;
SmtpServer.Send(mail);
The issue I believe is that the servers are located in the DMZ...anyone have any insight on how to fix this? If we assign the user with domain admin rights, the emails work...due to security reasons we don't want to go that route.
Issue resolved...the network team didn't have port 587 available...once they added it, emails started working for anonymous sender. I no longer need to use credentials. Thanks to all who replied.
I am trying to create a web application which upon entering your email address and message , sends an email with this information from the email address.
I used this:
try
{
NetworkCredential login = new NetworkCredential("your_____#gmail.com", "password");
System.Net.Mail.MailMessage email = new System.Net.Mail.MailMessage();
email.To.Add(new MailAddress("my____email#gmail.com"));
email.From = new MailAddress("your_____#gmail.com");
email.Subject = "Question";
email.Body = question;
SmtpClient client = new SmtpClient("smtp.gmail.com");
client.EnableSsl = true;
client.UseDefaultCredentials = false;
client.Credentials = login;
client.Send(email);
}
catch
{
}
But its giving me an SMTP error.
"Service not available, closing
transmission channel. The server
response was: Cannot connect to SMTP
server 209.85.129.111
(209.85.129.111:25), connect error
10051" System.Exception
{System.Net.Mail.SmtpException}
To send through your gmail account, you need to connect to port 587:
SmtpClient client = new SmtpClient("smtp.gmail.com", 587);
You do not need to specify port 587 - the code works without it. I have successfully sent and received e-mail using:
SmtpClient client = new SmtpClient("smtp.gmail.com");
If you look at the error closely, it says "Cannot connect to SMTP server" and error 10051 means the network is unreachable. Do you have a firewall blocking port 587?
Gmail uses port 465 and the erros show port 25
try using 465 port
http://mail.google.com/support/bin/answer.py?answer=76147