0 votes
by (120 points)
edited

I'm getting a System.OutOfMemoryException when I do a Login command on my smtp client. Why would this happen?

Applies to: Rebex Secure Mail
by (13.0k points)
It looks strange. Could you please edit your question and include more details such as 1) full exception including the stack trace (you can get it be calling the exception.ToString()). 2) SMTP communication log produced using a LogWriter property as described at http://www.rebex.net/kb/logging.aspx ?
by (132k points)
It turned out the attachments you were using were truly massive (like 1GB). Because attachment data was kept in memory, this caused OutOfMemoryException.

1 Answer

0 votes
by (132k points)
edited

It turned out the attachments you were using were truly massive (like 1GB). Because attachment data was kept in memory, this caused OutOfMemoryException sooner or later.

Since Rebex Mail 1.0.3793.0, it is possible to save or send mail messages with attachments of unlimited length using the following code:

// create an e-mail
MailMessage mail = new MailMessage();
...

Attachment attachment = new Attachment();
attachment.Options |= MimeOptions.DoNotPreloadAttachments; // <-- this is new
attachment.SetContentFromFile(attachmentPath);
mail.Attachments.Add(attachment);

// save the e-mail
mail.Save(path);

// send the e-mail
Smtp smtp = new Smtp();
smtp.Connect("server01");
smtp.Options |= SmtpOptions.SendWithNoBuffer; // <-- this is new
smtp.Send(mail);

At the moment, this doesn't work when the e-mail needs to be signed or encrypted – in that case, the content is still read into memory.

...