on .NET Framework , allows applications to send e-mail by using the Simple Mail Transfer Protocol (SMTP)
Questions tagged [smtpclient]
1275 questions
7
votes
7 answers
SmtpClient very slow - about 2 seconds to send one very small email
I'm using SmtpClient to send a simple email.
The email consists of about 25 plaintext characters so it's small.
It however takes the SmtpClient about 2000 milliseconds to send one of them. I do not create the SmtpClient for each send - that is…
Ted
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7
votes
1 answer
NodeMailer queuing outgoing email, but email never sends
I'm trying to send an email from my own domain without using an external SMTP server. I'm using NodeMailer's SMTP connection:
let options = {
secure: true,
port: consts.portOut,//465
host: consts.host, //mydomain.com
transactionLog:…
now_world
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7
votes
1 answer
What could be reasons that Microsoft retired SmtpClient?
In .NET Framework 4.7 doc, Microsoft marked SmtpClient obsolete with the following reason:
SmtpClient and its network of types are poorly designed, we strongly
recommend you use https://github.com/jstedfast/MailKit…
Luke Vo
- 17,859
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7
votes
4 answers
SmtpClient won't authenticate when inflated from web.config
When using the system.net/mail web.config settings to configure my SmtpClient, it fails to deliver emails, with an "protocol error" described best by Base64 encoding and authentication problems:
Example:
With the following Config
…
Matt Murrell
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7
votes
1 answer
SmtpClient.SendAsync not sending email versus SmtpClient.Send
I am working on a project which (unfortunately) requires the maximum framework allowable to be .NET 4.
In this project I am attempting to send an email asynchronously using SendAsync() but for some reason, it fails to send (or rather, it just…
tastydew
- 677
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- 21
7
votes
2 answers
Cause of TaskCanceledException with SendMailAsync?
I don't understand the difference between these two implementations of calling SendMailAsync. Much of the time with the first, I'm receiving a TaskCanceledException, but with the second, everything works as expected.
I thought the two consuming…
Brian Vallelunga
- 9,869
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7
votes
1 answer
Execute default certificate validation when overriding ServicePointManager.ServerCertificateValidationCallback
I use a SmtpClient to send emails through a SMTP server using SSL. This SMTP server is configured to use a self-signed certificate.
Since it's out of scope for me to install the certificate on all client machines, I added a…
Benjamin Beaulieu
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7
votes
1 answer
"The function requested is not supported" exception when using SmtpClient in Azure role
I'm getting an exception when using SmtpClient in an Azure Web or Worker role.
I created a console app to manually run on the role VMs via RDP to reproduce:
using System;
using System.Net;
using System.Net.Mail;
using System.Text;
namespace…
Mike Asdf
- 2,309
- 26
- 34
7
votes
2 answers
How to use any email address in the FROM field while sending email through Gmail SMTP?
I'm trying to send an email using gmail SMTP in C# using the code bellow
MailMessage message = new MailMessage();
message.To.Add("my email");
message.Subject = "subject";
message.From = new MailAddress("any email");
message.Body =…
Victor
- 8,309
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7
votes
1 answer
Using SmtpClient, and getting "the target machine actively refused it"
I am trying to use System.Net.Mail for an application to send an email, but get this exception:
System.Net.Mail.SmtpException: Failure sending mail. --->
System.Net.WebException: Unable to connect to the remote server --->
…
Cyberherbalist
- 12,061
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7
votes
2 answers
Why SmtpClient.UseDefaultCredentials is ignored?
I'm trying to send e-mails through a domain SMTP server which uses Integrated Windows Authentication. When explicitly specifying the credentials, everything works fine:
using (var client = new SmtpClient(""))
{
client.Credentials = new…
Arseni Mourzenko
- 50,338
- 35
- 112
- 199
6
votes
1 answer
How to send mails using SmtpClient and DefaultNetworkCredentials to a distribution list that only allows authenticated senders?
I'm trying to send automated emails from a C# console application from machines to clients all on the same domain via our internal Exchange 2007 server (using SMTP), but I'm hitting a snag with distribution lists that only allow authenticated…
russcollier
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6
votes
2 answers
System.Net.Mail and MailMessage not Sending Messages Immediately
When I sent a mail using System.Net.Mail, it seems that the messages do not send immediately. They take a minute or two before reaching my inbox. Once I quit the application, all of the messages are received within seconds though. Is there some sort…
mservidio
- 12,817
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6
votes
1 answer
SMTP mail with encrypt permission Outlook
When I send a mail with the option "Encrypt only" in Outlook
I receive a mail like this :
Currently, I use SMTPClient with MailMessage to send mail :
MailMessage message = new MailMessage();
message.From = from;
MailAddress to = new…
Antoine V
- 6,998
- 2
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- 34
6
votes
5 answers
Throttling speed of email sending process
Sorry the title is a bit crappy, I couldn't quite word it properly.
Edit: I should note this is a console c# app
I've prototyped out a system that works like so (this is rough pseudo-codeish):
var collection = grabfromdb();
foreach (item in…
ChadT
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