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08.21.2008 at 11:07PM PDT, ID: 23669377
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9.2

Can't send attachments bigger than 1400KB with SmtpClient

Asked by softwarea in .NET, C# Programming Language

Tags:

Hi guys,

my application sends emails including attachments via SMTP.

Everything works fine as long as the attached files do not exceed a size of 1.400KB in total. However, if I try to send an email with an attachment of 1.500KB or more the email will not reach it's receiver.

Here is some more background info:
- I'm using an SmtpClient object and the SendAsync() method.
- I added an event handler to the SmtpClient object in order to be notified when SendAsync() has been completed (see attached code). The weired thing: I get no error message. I seems like the emails really have been sent (including the attachments), because SmtpClient_OnCompleted() reports "E-MAIL SENT" (see attached code).
- The files I'm sending are dummies (created by a file creator that let's me generate files of any size). But I also tried "real" file types like PDF or GIF. No difference. So I believe the file type can not be the problem.
- Of course I've already tried different receiver email addresses to make sure it's not an issue of the receiver's mailbox limitations.

As I can send attachments with 1.400KB or less I believe that my code should be fine in general. Maybe there is some configuration setting that controls the maximum file sizes?

I would appreciate any help. It's quite urgent!

Thank you!
IngmarStart Free Trial 
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private Exception SendEMail(string mailSubject, string mailBody, MailAddress mailFrom, MailAddressCollection mailReplyTo, MailAddressCollection mailTo, MailAddressCollection mailCC, MailAddressCollection mailBCC, List<string> mailAttachments)
        {
            Exception result = null;
 
            MailMessage EMail = new MailMessage();
 
            //Prepare EMail
            try
            {
                EMail.Subject = mailSubject;
                EMail.Body = mailBody;
                EMail.From = mailFrom;
 
                foreach (MailAddress address in mailTo)
                {
                    EMail.To.Add(address);
                }
                foreach (MailAddress address in mailCC)
                {
                    EMail.CC.Add(address);
                }
                foreach (MailAddress address in mailBCC)
                {
                    EMail.Bcc.Add(address);
                }
                foreach (MailAddress address in mailReplyTo)
                {
                    EMail.ReplyTo = address;
                }
                //Attachments
                foreach (string attFile in mailAttachments)
                {
                    if (File.Exists(attFile))
                    {
                        Attachment newAttachment = new Attachment(attFile);
                        EMail.Attachments.Add(newAttachment);
                    }
                }
 
                //Additional settings
                EMail.IsBodyHtml = true;
 
                //Send EMail
                //Read smtp host settings
                PvConfigurationEntity smtpHost = new PvConfigurationEntity();
                smtpHost.FetchUsingUCCfg_Key("SMTPHost");
                PvConfigurationEntity smtpUserName = new PvConfigurationEntity();
                smtpUserName.FetchUsingUCCfg_Key("SMTPUserName");
                PvConfigurationEntity smtpUserPassword = new PvConfigurationEntity();
                smtpUserPassword.FetchUsingUCCfg_Key("SMTPUserPassword");
 
                if (smtpHost.Cfg_Value != null && smtpHost.Cfg_Value != "")
                {
                    //Create smtp client
                    System.Net.Mail.SmtpClient SmtpClient = new System.Net.Mail.SmtpClient();
                    //Configute smtp client
                    //Smtp server
                    SmtpClient.Host = smtpHost.Cfg_Value;
                    //Smtp authentication
                    if (smtpUserName.Cfg_Value != null && smtpUserName.Cfg_Value != "")
                    {
                        //Use user credentials
                        SmtpClient.Credentials = new NetworkCredential(smtpUserName.Cfg_Value, smtpUserPassword.Cfg_Value);
                    }
                    //Wire up the event for when the Async send is completed
                    SmtpClient.SendCompleted += new SendCompletedEventHandler(SmtpClient_OnCompleted);
                    //Result object
                    object userState = EMail;
                    //Send email
                    SmtpClient.SendAsync(EMail, userState);
                }
            }
            catch (Exception e)
            {
                result = e;
            }
            return result;
        }
 
        private void SmtpClient_OnCompleted(object sender, AsyncCompletedEventArgs e)
        {
            //
            //Analyze the result of the email sending
            //
 
            //Get the Original MailMessage object
            MailMessage mail = (MailMessage)e.UserState;
            //Build protocol string
            //TO
            string summary = mail.Subject + ", To: " + mail.To.ToString();
            //CC
            if (mail.CC.ToString() != "")
                summary += ", CC: " + mail.CC.ToString();
            //BCC
            if (mail.Bcc.ToString() != "")
                summary += ", Bcc: " + mail.Bcc.ToString();
            //Attachments
            foreach (Attachment att in mail.Attachments)
            {
                summary += ", Attached: " + att.Name;
            }
            //FROM
            summary += ", From: " + mail.From + ", Date: " + DateTime.Now.ToString();
 
            //Evaluate result
            if (e.Cancelled)
            {
                LogEvent("E-MAIL CANCELED: " + summary, EventLogEntryType.Warning, 101, 100);
            }
            if (e.Error != null)
            {
                LogEvent("E-MAIL FAILED: " + summary + "***********" + e.Error.ToString(), EventLogEntryType.Error, 102, 100);
            }
            else
            {
                LogEvent("E-MAIL SENT: " + summary, EventLogEntryType.Information, 103, 100);
            }
            //Release all resources and handles on resources (e.a. handle on the attachments)
            mail.Dispose();
        }
[+][-]08.22.2008 at 04:25AM PDT, ID: 22288532

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About this solution

Zones: .NET, C# Programming Language
Tags: C#
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Solution Provided By: EricTViking
Participating Experts: 1
Solution Grade: A
 
 
[+][-]08.22.2008 at 05:34AM PDT, ID: 22289095

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