System.Net.Mail Performance Problem

Posted on 2006-11-03
Medium Priority
Last Modified: 2012-06-27
Hi - I use the following to send emails from my site. Problem is that the send takes 40 secs but is successful! Anyone have any idea why?
The SMTP service is local on the IIS webserver and suffers from no other performance issues.

Dim MM As New System.Net.Mail.MailMessage(New Net.Mail.MailAddress(FromAddress), New Net.Mail.MailAddress(ToAddress))
MM.Subject = mailsubject
MM.Body = Message
MM.IsBodyHtml = False
Dim smtp As New System.Net.Mail.SmtpClient(System.Configuration.ConfigurationManager.AppSettings("MailServer"))
smtp.Credentials = New System.Net.NetworkCredential(System.Configuration.ConfigurationManager.AppSettings("SMTPUser"), System.Configuration.ConfigurationManager.AppSettings("SMTPPswd"))
smtp.Send(MM) 'this line TAKES 40 SECONDS!

Question by:ctudorprice
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LVL 28

Expert Comment

ID: 17868274
does it process for 40 seconds or does the mail take 40 seconds to be received? If it takes 40 seconds to send then I would check your anti-virus and see if it is scanning the smtp mail and if it is blocking port 25. You may also need to check if the router is blocking port 25. If it takes 40 seconds to be received, that isn't anything you can really take care of.

Author Comment

ID: 17868676
process the "send" for 40 seconds on the webserver - I have tracing and timing.
LVL 28

Accepted Solution

strickdd earned 2000 total points
ID: 17868686
I would try disabling your antivirus for one test. Also you should check and make sure the SMTP Port (port 25) doesn't have any blocks...

Author Comment

ID: 17870046
Hi - it was actually the mail server's Sender Policy Framework (SPF) check that was causing the massive delay... disabled it and mail works fine.
Thanks for the advice strickdd.

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