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Ever since I posted a quick guide to sending email via Mailkit in. NET Core 2I have been inundated with comments and emails asking about specific exception messages that either Mailkit or the underlying.
NET Core. Rather than replying to each individual email, I would try and collate all the errors with sending emails here. Port 25 25 is typically used a clear text SMTP port. So set your email client accordingly.
However it does not use TLS. Typically anything where you need to set SSL to be on or off should be set to off. This one is an easy fix. So for example using smp. See the next error for port issues! Another rather simple one to fix.
So if you try and send an email with an incorrect port, it might take about 30 seconds for the exception to actually surface. This is important to note if your system slows to a crawl as it gives you a hint of what the issue could be even before checking logs.
I want to point out this is a MailKit exception, not one from. As an example, when connecting to Gmail, the port is used for SSL connections. If I try and connect to Gmail with the following Mailkit code :. And what do you know, we get the above exception. Another Mailkit specific exception. This one can be a bit confusing, especially because the full error log from MailKit talks about certificate issues Which it totally could be!
So for example, the following will not work :. Again, sometimes this is because the SSL connection truly is bogus Either because the certificate is bad, expired etcor because you are connecting to a port with no security whatsoever. This is an exception that has a whole range of causes, but the most common is forcing an SSL connection on a TLS port. This one is a little weird because you basically have to go right out of your way to get this exception.
AuthenticationException: AuthenticationInvalidCredentials: 5. Goes without saying, you have the wrong username and password. This is not going to be any connection issues.
This is one of the errors that constantly bugs me.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. MailKit is a cross-platform mail client library built on top of MimeKit.
MailKit is a personal open source project that I have put thousands of hours into perfecting with the goal of making it the very best email framework for.
I need your help to achieve this. Donating helps pay for things such as web hosting, domain registration and licenses for developer tools such as a performance profiler, memory profiler, a static code analysis tool, and more.
It also helps motivate me to continue working on the project. The main goal of this project is to provide the. All of the other. NET IMAP client implementations that I could find suffer from major architectural problems such as ignoring unexpected untagged responses, assuming that literal string tokens will never be used for anything other than message bodies when in fact they could be used for pretty much any string token in a responseassuming that the way to find the end of a message body in a FETCH response is by scanning for " UID"and not properly handling mailbox names with international characters to simply name a few.Sending Email Using Mailkit #4 - ifz.realtekrtl8111carnati.pw Core 2
NET IMAP libraries, at least, were written by developers that only cared enough that it worked for their simple needs. There's nothing necessarily wrong with doing that, but the web is full of half-working, non-RFC-compliant IMAP implementations out there that it was finally time for a carefully designed and implemented IMAP client library to be written. NET are actually fairly decent, although the MIME parser is far too strict - throwing exceptions any time it encounters a Content-Type or Content-Disposition parameter that it doesn't already know about, which, if you read over the mailing-list, is a problem that OpenPOP.
NET users are constantly running into. MailKit's Pop3Client, of course, doesn't have this problem. It also parses messages directly from the socket instead of downloading the message into a large string buffer before parsing it, so you'll probably find that not only is MailKit faster MailKit's MIME parser, MimeKitparses messages from disk 25x faster than OpenPOP.
NET's parserbut also uses far less memory. SmtpClient which suits their needs more-or-less satisfactorily and so is probably not high on their list of needs. However, the SmtpClient implementation included with MailKit is a much better option if cross-platform support is needed or if the developer wants to be able to save and re-load MIME messages before sending them via SMTP.
But I have got An exception of type 'MailKit. AuthenticationException' occurred in MailKit. Additional information: Authentication failed. I don't want to change my security settings. Because I want that everything will be secure.
That's why I start to use MailKit rather than System.
Common Errors When Sending Email With Mailkit
The first thing you need to do is follow Google's instructions for obtaining OAuth 2. Once you've done that, the easiest way to obtain an access token is to use Google's Google. Auth library:. Now that you have an access token credential. AccessTokenyou can use it with MailKit as if it were the password:. Learn more. How to send email by using MailKit? Ask Question. Asked 4 years, 8 months ago. Active 1 month ago. Viewed 50k times. Add new MailboxAddress "Joey Tribbiani", "noreply localhost.
Add new MailboxAddress "Mrs. Chanandler Bong", "mymail gmail. Connect "smtp.GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project?
Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. It seems, that MailKit disregards Timeout option for Connection operation. For read and write operations it works correctly. Hello, are you sure that your changes will fix this issue? I thought that the common approach to set connection timeout for Socket in.
Net is to make a call of BeginConnect and after that wait until timeout happens or not happens. Something like described here How to configure socket connect timeout. Sounds like it won't work. I would recommend using that code yourself to connect and then passing the Socket to the Connect method that takes a Socket argument.
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Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Labels enhancement. Copy link Quote reply.
Fixes issue I don't want to deal with the mess to support this. Sign up for free to join this conversation on GitHub. Already have an account?
When I'm using standard System. SmtpClient library it's working without any problems but when using MailKit it throw me error:. Error sending mail. No connection could be made because the target machine actively refused it. I added one solution with two console projects. One using MailKit and other System. All settings parameters looks are the same but it doesn't work in MailKit:.
And this throw the same exception like this one in NLog. Connect "smtp. In other project which using System.
Mail everything is working fine and the mail is sent successful. I'm starting them on same machine, same environment just change the startup point of console application to test so the connectivity is not a problem :. I can't find what is the issue with MailKit. The settings looks like identical. Do you have some idea what can be a problem? Is it bug or have some problem in my settings? I just partly-solved a very similar problem merely a few minutes ago; what I learned may help you.
Recently I updated all the Nuget packages, thinking it was good practice to do this. Then I later discovered that my working SMTP send code had suddenly stopped working and it was reporting identical error to what you have experienced. With this situation I checked all kinds of problems with smtp server, firewall, etc.
The send code began working again once MailKit had the version downgrade.
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Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Server name: smtp. I think the problem is I am not telling the SmtpClient to use tls but I cant find documentation on how to do this.
One thing I did try is the following but it did not seem to work. Due to the confusion, I've implemented a separate Connect method that makes this more obvious what is going on:. According to MailKit Doc. The useSsl argument only controls whether or not the client makes an SSL-wrapped connection. Learn more. Asked 4 years, 11 months ago. Active 1 month ago. Viewed 12k times. Connect "SMTP. Authenticate username, password ; client. Send FormatOptions. One thing I did try is the following but it did not seem to work client.
Rob I've tried with true and I get a Handshake failed due to unexpected packet format. Active Oldest Votes. Connect "smtp. StartTls ; client. Ogglas Depends on where it is hanging. If it is in the socket. Connect call, then no. If it is in the code that reads the greeting, etc after the socket.
Connectthen yes - set the client. Timeout value. You can set your options to "SecureSocketOptions. Auto" something like this await client. ConnectAsync mailService. Host, mailService. Port, SecureSocketOptions. What does it use to decide?
The port number?GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Was looking over your project and tried some sample implementations.
Couple of things. I think that by default it should return false because I may not have a valid certificate that I may be trying to use with the connection. Right now, it's a "silent fail" and I have no idea I am using invalid certificate when indeed I am. Right now, if I try to connect to the server, it take 20 seconds to tell me that this server is not available, obviously not acceptable.
Right now I did this:. Since this seems like it's just a bug in Mono, I've changed my mind and have updated the code to be stricter. However, we'll see how it goes Thanks Jeff! I would agree and disagree with you about self signed certificates. I'd rather know that there's something wrong with my self signed certificate and have it fail on me. At the same time I see your concern. I'll check out your latest commit in a few days, I'm currently occupied with something else.
Btw, looking forward to using MailKit and MimeKit in my project :. Skip to content. Dismiss Join GitHub today GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together.
Sign up. New issue. Jump to bottom. Labels question. Copy link Quote reply. Hi Jeff, Was looking over your project and tried some sample implementations. BeginConnect ipAddresses[i], port, null, null ; if! TimedOut ; What are your thoughts on this? Taking your suggestion would make developers instantly reject MailKit thinking that MailKit was somehow broken when in fact it is not.
Just set your own RemoteCertificateValidationCallback. You can set the timeout in your own program. You might be 2 or 3 hops from your mail server, but most people are not. Update: This works on Microsoft's.