i am creating an email client that sends e-mail address from server ip instead of SMTP , i wrote that code:
SmtpClient server = new SmtpClient("50.23.128.66");
MailMessage msg = new MailMessage("from#yahoo.com", "tome#yahoo.com", "subject", "body");
server.Send(msg);
but when i run it , i get that error:
Unhandled Exception: System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: 5.7.1 Relaying Denied.
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressColl
ection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
* By the way i am using Windows Server 2008 *
and i configured the smtp server to localhost and port 25 , but i don`t know what is that relying error .
If you are using you localhost to rely email, you should be using 127.0.0.1 or localhost instead of that ip address you posted in your code.
Relaying is the method the SMTP server uses to authenticate that it should route the email from a particular sender. An "open relay" means that there is no authentication and the SMTP server will send email sent from anyone. This is not a good practice and there are probably some mechanisms on this particular SMTP server to authenticates, such as a user name and password or even the IP address of the sender. Check with the administrator of the SMTP server to see what is required. I would think at a minimum you would need to set the user name and password, which you did not do in your code example.
Related
I have a program that I want to run on a server which is able to monitor various servers on a network and send out email notifications when certain situations involving those servers occur.
Currently, I am able to run this program on my local machine, and have it fire off emails (using gmail SMTP). However, when I try to run it on the server via the command prompt, it throws the following exception:
Unhandled Exception: System.Net.Mail.SmtpException: Failure sending mail. --->
System.Net.WebException: Unable to connect to the remote server --->
System.Net.Sockets.SocketException: 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
xxx.xxx.xxx.xxx:587
The code related to the sending of the email is fairly simple:
static void sendEmail(MailAddressCollection mailCollection, string emailSender,
string emailDisplayName, string emailPassword,
string subject, string body) {
MailAddress fromAddress = new MailAddress(emailSender, emailDisplayName);
SmtpClient smtpClient = new SmtpClient {
Host = "smtp.gmail.com",
Port = 587,
EnableSsl = true,
DeliveryMethod = SmtpDeliveryMethod.Network,
UseDefaultCredentials = false,
Credentials = new NetworkCredential(fromAddress.Address, emailPassword)
};
MailMessage message = new MailMessage {
From = fromAddress,
Subject = subject,
Body = body
};
foreach (MailAddress mailAddress in mailCollection) {
message.To.Add(mailAddress);
}
smtpClient.Send(message);
}
The server in question is a 2008R2 box, and it does not have Windows Firewall enabled. Also, port 25 is definitely open, as this server can send other types of emails (specifically, those generated by a Dynamics CRM email router).
What could be causing this error?
The issue was related to Gmail blocking the IP address of the server attempting to send email.
When attempting to send emails using a Gmail account, first attempt logging into Gmail manually on that machine specific at that specific IP address, using a browser. I ultimately had to do this and go through the process of authenticating that the email send attempts from my server (being generated programmatically) were legitimate. If you do not go through this process like I did, Gmail can assume that your server is not a legitimate email sender and can continue to assume all traffic from your IP address is invalid--until you formally validate that IP address as described above.
I have following piece of code, usiong which I am trying to send an email. I am using another server as SMPTClient.
MailMessage message = new MailMessage();
message.To.Add(toEmailId);
message.Subject = "test Subject";
message.From = new System.Net.Mail.MailAddress("myid#xyz.com");
message.Body = "This is a system generated email. Please do not reply";
SmtpClient smtp = new SmtpClient("anotherservername");
smtp.Send(message);
While debuggin, I get error at last line. The error is:
An attempt was made to access a socket in a way forbidden by its access permissions SERVER IP :25
I found out from internet that My firewall might be blocking me to access that server's port, or is there any setting, configuration which I have missed. Apparently the applications deployed on that server are able to send emails. I am still building one to test.
Some servers perform authentication and authorization by checking if you've connected to POP server some time before connecting to SMTP. You should try first connecting and authenticating with POP and afterwards connecting to SMTP.
Historically, email clients first checked and then sent emails in Send&Receive routines, so this was used as poor mans authorization. Take a look at wikipedia article about POP before SMTP.
Another issue which caused this for some people is how server address is provided to SmtpClient. You should use constructor which explicitly provides port number instead of appending it to IP/hostname. I.e.
instead of new SmtpClient("123.123.123.123:25")
use new SmtpClient("123.123.123.123", 25)
I created this email address "info#mydomain.com" and I want users be able to send email for me through my website.
Here is my code:
MailMessage mailObject = new MailMessage("a#b.com(this is fake email)", "info#mydomain.com", "contact us", "Test message");
SmtpClient smtpC = new SmtpClient("smtp server name");
smtpC.Send(mailObject);
Problem is I dont know what to write for smtp server name. How can I find what is my smtp server name?
This is the address of the SMTP server you want to use. e.g. smtp.gmail.com if you're using Gmail.
Search you email or hosting provider's website for "SMTP". Most likely they will have the details (smtp server name, port, ssl or not) soewhere in the FAQs.
Mostly the SMTP Server Name should be smtp.mydomain.com
Still it is best to contact the hosting provider
Open up a command prompt (CMD.exe)
Type nslookup and hit enter
Type set type=MX and hit enter
Type the domain name and hit enter, for example: google.com
The results will be a list of host names that are set up for SMTP
i am trying to send email from c# windows application and i need SMTP Server Address to send email but i don't know about SMTP Server Address, what is SMTP Server Address, how to get SMTP Server Address and how to use it.
this is the code:
System.Web.Mail.MailMessage message=new System.Web.Mail.MailMessage();
message.From="from e-mail";
message.To="to e-mail";
message.Subject="Message Subject";
message.Body="Message Body";
System.Web.Mail.SmtpMail.SmtpServer="SMTP Server Address";
System.Web.Mail.SmtpMail.Send(message);
What Mail Server are you trying to use??? usually you can just google SMTP or POP3 or whatever protocal your looking for and it will give you the port, server and all the extra information you need to connect to it.
For example:
http://support.google.com/mail/bin/answer.py?hl=en&answer=13287
First, the System.Web.Mail namespace utilities are marked as 'obsolete' and should not be used. Instead, you should use System.Net. In that namespace there is a 'MailMessage' and an 'SmtpClient' class that will do the job you are trying to do.
Next, an SMTP server is a process that runs on a computer, which, when connected to the inetrnet, can listen for, and respond to, incoming requests which use a particular protocol on a particular port. You can think of an SMTP server as the machine at the post office that sorts and routes the mail to the appropriate mailbox..
An SMTP server has an address, just like everything else on the internet that needs to communicate with anything else. The address is used to send your mail message to the right machine, on the right communication channel. you could think of it as its phone number, and your mail message a text that will be sent to it.
Next, the address you are looking for, last time I checked, was: smtp.gmail.com.
So, considering that you need to stop using System.Web.Mail, and considering that your address may be smtp.gmail.com, here is what your code should look like:
// setup mail message
MailMessage message = new MailMessage();
message.From = new MailAddress("from e-mail");
message.To.Add(new MailAddress("to e-mail"));
message.Subject = "Message Subject";
message.Body = "Message Body";
// setup mail client
SmtpClient mailClient = new SmtpClient("smtp.gmail.com");
mailClient.Credentials = new NetworkCredential("youraccount#gmail.com", "yourGmailPassword");
// send message
mailClient.Send(message);
Also, here is a decent looking article on using gmail as your smtp server:
How to use Gmail as your SMTP server
Also, if gmail does not work for you, you can use the smtp server of your internet provider. They will usually have their smtp address lurking on their website somewhere to be helpful to customers who want to setup their email program. You can also look in Outlook under account settings if you cannot find it somewhere else, if you use anything besides gmail, you should find one there.
Lastly, keep in mind, email cannot be sent without using an smtp server which is willing to receive and dispatch your maill message. In general this is something like gmail, or the smtp server of your internet provider, and the address will normally be: smtp.providername.com. However, gmail, for example, requires your account credentials for the smtp server to allow your message to be received and dispatched.
i have this error when i sending email through our web application
" Mailbox unavailable. The server response was: Requested action not taken: mailbox unavailable or not local"
this is detail of error
System.Net.Mail.SmtpFailedRecipientException was caught
Message=Mailbox unavailable. The server response was: Requested action not taken: mailbox unavailable or not local
Source=System
FailedRecipient=<email#email.com>
StackTrace:
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at email.Globals.SendMail(String EmailID, String subject, String message, String senderMail) in C:location
InnerException:
I would assume that your sender credentials are not in order - if the recipient's mailbox is unavailable, you will get an E-Mail saying so but the actual sending process should work out (if it's not a local recipient).
If I had to guess, I'd say you are trying to send an E-Mail with a sender address belonging to a domain that is not managed by the SMTP server you are using to send the E-Mail (e.g. a GMail address).
It means that the mailbox belonging to "email#email.com" is either not available (it is over its quota or something similar) OR the server is not allowing you to relay emails (which it would have to do if "email#email.com" is not a local domain). It is common for mail servers to behave this way, because it is not desirable for a mail server to act as an open relay.
My best guess is that you problem has to do with the latter. If you have control over the server, you could allow relaying from the server that's hosting your web application.