Urgent:Asp.Net 3.5 Is there any limitation for sending message? Email delivery is failing when message is little large

Question

Hi Experts! In the asp.net 3.5 C# I am using Text box with multiline property. I am using smtp to send the email. SmtpClient smtpClient = new SmtpClient(); MailMessage message = new MailMessage(); I am filling up all other values like To Cc etc. and then getting the textbox text to fill the message body: message.Body = txtboxmessage.Text.ToString(); I observe that when the textbox has very less lines of text it sends mail successfully. However when it cosists of more lines of text it fails. Can anyone advise me how to overcome this problem? Also please advise how to create email in such way that HTML markup can be added to the message (just like gmail or yahoo or anyother general emails)? Appreciate quick responses. Thanks

Dinesh Kumar · Answer

hi Use iframe instead of using textarea . Use this into relevant area of aspx page. iframe id ='txtDescription' style =background-color:White;display:block;height:380px;width:100%;border:solid 1px #7F9DB9;  runat =server> iframe > input type =hidden name =hdnIds id =Hidden1 runat =server /> //put this code inside ur script var iframe = document.getElementById( 'txtDescription' ); iframe.contentWindow.document.designMode = on ; function getValue() { var iframe = document.getElementById( 'txtDescription' ); document.getElementById( 'Hidden1' ).value = iframe.contentWindow.document.body.innerHTML; } function setValue() { var iframe = document.getElementById( 'txtDescription' ); iframe.contentWindow.document.write(document.getElementById( 'Hidden1' ).value); } //Call setValue in body onload. body onload =setValue();> //Call getValue in the onclientclick of send button asp : Button ID =btnSend runat =server CssClass =input_button OnClientClick =getValue(); Text =Send OnClick =btnSend_Click/> protected void btnSend_Click( object sender EventArgs e) { try { string strToAddress = txtToAddress.Text.ToString(); string strMailContent = Hidden1.Value; string strMailSubject = txtSubject.Text.ToString(); string strCCAddress = string .Empty; if (txtCcAddress.Text.ToString() !=  ) { strCCAddress = txtCcAddress.Text.ToString(); } //This below funtion is to send mail if (fnSMTPMailSend(strMailContent strMailSubject strToAddress strCCAddress)) { ShowMessage( Mail sending success! ); } else { ShowMessage( Mail delivery failed. Please retry. ); } } catch ( Exception ex) { HandleError(ex); } } public bool fnSMTPMailSend( string strMailContent string strSubject string strToAddress string strCCAddress) { //ur code.. objMailMessage.Body = strMailContent; objMailMessage.IsBodyHtml = true ; //then ur code.. } Don't forget to check if it helps.. Thanks & Regards Dinesh Kumar

Kirtan Patel · Answer

Mokshasri i have provided you link in my above post just check it out :)

Sam Hobbs · Answer

See Internet Message Format [RFC-Ref] ; it is the official standard for email. You won't find a limit on size in the standard. Most email servers have a size limit but the standard does not. There are other RFCs for other things relevant to attachments but you won't find a size limit for any of that either. Are you sure that your connection's upload speed is fast enough?

Mokshasri · Answer

So using mail.IsBodyHtml = true; will accept the message with HTML content. But is there way or controls available where in I can see in the User Interface or page itself the HTML buttons just like how this messagebox on this site is showing? My message is hardly in KBs and no attachments also but still it is failing. Can you please provide a sample code in asp.net and C# where it is possible to message of size within this limit say 1MB? Appreciate if you can provide a sample working code so that I can learn. Thanks.

Hiren Soni · Answer

As per you say that is correct...whenever i make attachment to around 3 to 4 mb..it will not done. ..but it is a because of slow connection..n get timeout error..if u get timeout error just set timeout property of smtp class.

Kirtan Patel · Answer

Friend for Allowing HTML in body write code like below . mail.IsBodyHtml = true; mail only allow 25 MB data send in one mail message :) if still need assistance then read below article http://www.codedigest.com/Articles/ASPNET/95_Sending_Email_using_C__and_ASPNet_20.aspx please check do you like this answer check box if it helps you :)