Develop Reference

Sending mail from office365 account C# mail headers

I can send mail with a valid Office365 account using my C# web application to a list of opt-in addresses. So it is our own data source with our customers in it. The problem is that it is probably not received by our customers. I have send a mail from the info account to my own office365 account and pasted the headers in mxtoolbox and got a message that my local pc is blacklisted. even when it is using the smtp of office365. We have dkim enabled and spf in the dns. What else should I do to troubleshoot this?
Here is my simple C# code for sending the mail (which works, but might needs additional anti-spam stuff?)
SmtpClient sc = new SmtpClient();
sc.Host = "smtp.office365.com";
sc.Credentials = new System.Net.NetworkCredential(SmtpUsername, SmtpPassword);
sc.Port = 587;
sc.EnableSsl = true;
Should I add my home IP and from the office to the SPF dns entry, even when I am using the smtp of office365?
this is the value for Authentication-Results
dkim=none (message not signed) header.d=none;ouroffice365domain.com; dmarc=none action=none
Is that the cause for getting on the blacklist? Please note that I am not trying to send spam. It is a valid data source where people opted in for. We are just migrated to office365 and need to send a mailing to our customers from our custom web application. We are aware of the limitations (10k per day) and 1 mail every 2 sec.
edit will change this: https://stackoverflow.com/a/23409351/169714 because I just used the mail address and not the first and last name of the customer.

Not having DKIM setup is not going to get you blackisted, having it set up improperly can. Your HOME PC should have nothing to do with SPF, it's the lasting sending IP which should be OFFICE 365 IP. Did you validate your DKIM and SPF by sending an email to mailtest#unlocktheinbox.com or check-auth#verifier.port25.com?
I also don't think your LOCAL PC is blacklisted, it's the IP of your INTERNET Provider that is blacklisted. Unless you have a static IP it will change.

Email not reaching a specific email domain from php or C#

I am currently using an Office 365 account to send email from various websites. I have implemented an smtp client in both php and C# to send the mail. I use GoDaddy and Rackspace to hosts my sites.
The mail reaches most address without issue, however, I have a business domain through Google, which ends with .co, and emails do not make it to my inbox there.
Here are the settings for the PHPMailer client:
$mail = new PHPMailer;
$mail->isSMTP();
$mail->SMTPSecure = "tls";
$mail->Host = 'smtp.office365.com';
$mail->SMTPAuth = true;
$mail->Username = '<myuser>';
$mail->Password = '<mypassword>';
$mail->Port = 587;
$mail->setFrom('noreply#<mymaildomain>.com', 'MyMail');
The settings send email find to yahoo, gmail, etc. However, when I try to send it to my .co email address, the client indicates the mail was sent, but it never shows up in the inbox.
I am wondering if it is an issue with a domain in Google or if the .co is the problem. Is there any special setting I need to make on the client for .co addresses?
UPDATE
I changed phpmailer to simply use php's mail function. The mail was sent through to my .co domain, but I still have no idea why it will not go through when an authenticated SMTP user sends it. I can go into my Office 365 account and send email to the .co address without issue. I just cannot push it from the server. My host server does not contain the smtp server.

Sending email via exchange server issue. (system.net.mail vs microsoft.exchange.webservices)

I am developing a web application for my company. Part of it requires the internal user to fill out a form, and send an email on this user's behalf. It is all within the company. I searched and found two possible routes old system.net.mail and a more recent microsoft.exchange.webservices, but seems our exchange server requires credentials. I can only get the user's login and his email address login+"#company.com". How can i get this done?
Below are the codes i used smtp (system.net.mail), but it doesnt work.
string[] username =System.Security.Principal.WindowsIdentity.GetCurrent().Name.Split('\\');
string email = username[1] + "#company.com";
MailAddress from = new MailAddress(email);
MailAddress to = new MailAddress("someone#company.com");
MailMessage message = new MailMessage(from, to);
message.Subject = "testmail";
message.Body = "<h>testmail</h>";
message.IsBodyHtml = true;
SmtpClient client = new SmtpClient();
client.DeliveryMethod = SmtpDeliveryMethod.Network;
client.Send(message);

SmtpClient requires that you either specify the SMTP server directly, or that you have the right application/machine configuration settings for it to detect the server automatically. Your code is choosing the second option implicitly, and I suspect you don't have the right settings in app/machine config. Exchange does NOT support SMTP in its default configuration, afaik, so unless someone familiar with your Exchange server knows SMTP is configured and can give you the right address, SmtpClient is probably out.
Exchange Web Services (aka EWS) is probably your better answer, but it's not really a good one. In order to use exchange web services, you will need one of:
1) The domain, username, and password of the user so that you can pass the right NetworkCredential to EWS. In your case, this would probably mean the user has to enter their password into your form, which may break your requirements.
2) The user that the process is running as (in a web application, the application pool identity for IIS) has to have permissions to send mail as the user in question.
3) If you can use ASP.NET authentication to impersonate the user (this would only be a good approach in a LAN application), then you can effectively fall back to option (2), because now you will be talking to EWS as the user, who obviously will have permission to send mail from their own address.
As you can see, the right approach depends greatly on your Exchange/Active Directory/LAN setup.

Sending email through MS Outlook and disabling the warning

I have a C# program that I will be running on a daily basis (through Windows Scheduler). The program is to send a daily report to my team.
I have written the following to send the email and it works. the only problem is that Outlook shows a message box " A program is trying to send an e-mail message on your behalf. if this is unexpected...... " . there are three buttons "allow" "deny" "help" and it seems like my program is halted at that point and until i click the allow or deny button , the program doesn't send the email.
I know that the i can change the options by going into tools -> trust center -> programmatic access, but i would really like to not use that because this program would be eventually running from another machine where the user may or may not access to change the setting in trust center.
Is there a way to disable this warning programatically? ..or is there another way to send the email without having this warning popup
here is the code used to send the email..and it works fine..
Application olook = new Application();
NameSpace ns = olook.GetNamespace("MAPI");
ns.Logon(null, null, true, true);
_MailItem msg = (_MailItem)olook.CreateItem(OlItemType.olMailItem);
msg.To = "xxx#xxx.com";
msg.Subject = "test";
msg.HTMLBody = strHTML;
msg.Send();
ns.Logoff();

there are several ways to do that
you could disable the popup like #DJ KRAZE described
or you could send a message via smtp, if thats possible in your environment
see this: http://msdn.microsoft.com/en-us/library/system.net.mail.smtpclient.aspx
then you could use the "redemption library" i've used it and there will be no messages, because redemption suppresses them (or works around them) but the library is used via com, thats not that comfortable..
although you have to pay for that:
http://www.dimastr.com/redemption/home.htm
the thir alternative is using the managed Exchange Web Services
http://www.microsoft.com/download/en/details.aspx?id=13480
this is pretty straight forward and fun to use. you can get that via NuGet as well. :)
EDIT:
i forgot to mention, that Exchange Web Services are only available on Exchange 2007 SP1 or higher.
and this is what it looks like to send a message (after connect to the server)
EmailMessage message = new EmailMessage(service);
message.Subject = "Hello from the EWS Managed API";
message.Body = "Now that's easy!";
message.ToRecipients.Add("someone#fabrikam.com");
message.Save();
look here for an introduction: http://msdn.microsoft.com/en-us/library/dd637749(v=exchg.80).aspx

One of the easiest solutions is to use Exchange's SMTP server. Here's an example from MSDN.
string to = "jane#contoso.com";
string from = "ben#contoso.com";
MailMessage message = new MailMessage(from, to);
message.Subject = "Using the new SMTP client.";
message.Body = #"Using this new feature, you can send an e-mail message from an application very easily.";
SmtpClient client = new SmtpClient(server);
// Credentials are necessary if the server requires the client
// to authenticate before it will send e-mail on the client's behalf.
client.UseDefaultCredentials = true;
client.Send(message);
Of course, you'll have to check with your Exchange administrator to make sure that SMTP is enabled.

change sender address when sending mail through gmail in c#

I have used the following code to send mail from my web application using a gmail account. My question is, can i change the sender address to another address other than original sender(gmail) address?
My code is as follows:
System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
System.Net.NetworkCredential cred = new System.Net.NetworkCredential("sample#gmail.com", "*******");
Whatever i do is useless as i always receive mail from sample#gmail.com. Is it possible to change it?
I have changed to
mail.From = new System.Net.Mail.MailAddress("sample#yahoo.com"); but i received the mail with the from address sample#gmail.com and not from the new "From" address. I think gmail smtp overwrites the from address with the original credential.

This is the solution:
use the codes above to set mail.From = new MailAddress(address, display name)
in Gmail, go to Mail Settings >> Accounts and Import.
Add the email account you will use as sender in "Send Mail As". (tick as Alias)
This works for me

Gmail doesn't allow you to change the FROM to something different than your gmail account.
It doesn't matter what you use, they over-write it, before they relay it on. This prevent spamming/spoofing.

Yes just use the From property of the MailMessage
eg.
mail.From = "newemail#email.com";
EDIT: Also, see this post for more detailed info on how to emails via gmail in C#
Sending email in .NET through Gmail
EDIT: Although this works for mail in general, it appears this won't work for gmail as google overwrite it before its sent (see #Dave wanta's answer)

If you have a limited number of senders you can do as #philip suggested. For instance you may have customerservice#example.com, simon#example.com and philip#example.com or even alias#example.com. As long as they are approved senders on the actual gmail.com website you can send from them.
Gmail.com : Sending mail from a different address
If you are expecting to send from an arbitrary user (such as a customer service form on a website where the user enters their email and you don't want them emailing you directly) about the best you can do is this :
msg.ReplyToList.Add(new System.Net.Mail.MailAddress(email, friendlyName));
If you're in a controlled environment this works great, but please note that I've seen some email clients send to the from address even when reply-to is specified (I don't know which).

Check #56 and #58. They might be relevant to what you want to do
https://code.google.com/p/google-apps-script-issues/issues/detail?id=172