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SMTP Failure with Large AttachmentsI have created a website using C# ASP.NET 2.0. Users of the website are able to generate reports and email them from the website using SMTP mail configured under IIS 6.0. Although this works most of the time, messages greater than 2MB are bouncing when being sent to one domain (A). However, I can send much large files from the website (W) to my own address (B) and my hotmail account (H). I can then forward these emails to (A) without any problems. The failure messages are: Status: 5.2.3 Diagnostic-Code: smtp;450 5.2.3 Msg Size greater than allowed by Remote Host In summary, W to A fails W to B OK W to H OK H to A OK B to A OK The website's hosting company are saying that there are no restrictions on outgoing mail sizes. A's company have a size limit for incoming files, that is far higher than the 4MB messages that fail (by a factor of 10). I am now at a loss on how to diagnose this problem, so I'm looking for any help you can give. Regards, Dave. Hi Dave,
Is it possible that there's some spam filtering software on A will use different message size limit according to different sender? Apparently you're using different sender when sending from W, H or B. Sincerely, Walter Wang (waw***@online.microsoft.com, remove 'online.') Microsoft Online Community Support ================================================== Get notification to my posts through email? Please refer to http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif ications. If you are using Outlook Express, please make sure you clear the check box "Tools/Options/Read: Get 300 headers at a time" to see your reply promptly. Note: The MSDN Managed Newsgroup support offering is for non-urgent issues where an initial response from the community or a Microsoft Support Engineer within 1 business day is acceptable. Please note that each follow up response may take approximately 2 business days as the support professional working with you may need further investigation to reach the most efficient resolution. The offering is not appropriate for situations that require urgent, real-time or phone-based interactions or complex project analysis and dump analysis issues. Issues of this nature are best handled working with a dedicated Microsoft Support Engineer by contacting Microsoft Customer Support Services (CSS) at http://msdn.microsoft.com/subscriptions/support/default.aspx. ================================================== This posting is provided "AS IS" with no warranties, and confers no rights. No, apparently the spam filter still lets through 38MB files.
Show quote "Walter Wang [MSFT]" wrote: > Hi Dave, > > Is it possible that there's some spam filtering software on A will use > different message size limit according to different sender? Apparently > you're using different sender when sending from W, H or B. > > Sincerely, > Walter Wang (waw***@online.microsoft.com, remove 'online.') > Microsoft Online Community Support > > ================================================== > Get notification to my posts through email? Please refer to > http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif > ications. If you are using Outlook Express, please make sure you clear the > check box "Tools/Options/Read: Get 300 headers at a time" to see your reply > promptly. > > Note: The MSDN Managed Newsgroup support offering is for non-urgent issues > where an initial response from the community or a Microsoft Support > Engineer within 1 business day is acceptable. Please note that each follow > up response may take approximately 2 business days as the support > professional working with you may need further investigation to reach the > most efficient resolution. The offering is not appropriate for situations > that require urgent, real-time or phone-based interactions or complex > project analysis and dump analysis issues. Issues of this nature are best > handled working with a dedicated Microsoft Support Engineer by contacting > Microsoft Customer Support Services (CSS) at > http://msdn.microsoft.com/subscriptions/support/default.aspx. > ================================================== > > This posting is provided "AS IS" with no warranties, and confers no rights. > > If you use other email client to send email from domain W to domain A, does
this issue also occur? You may also try to compare the MIME header in the email that failed to send from W to A, with the email that is successfully sent to A from B or H. Regards, Walter Wang (waw***@online.microsoft.com, remove 'online.') Microsoft Online Community Support ================================================== When responding to posts, please "Reply to Group" via your newsreader so that others may learn and benefit from your issue. ================================================== This posting is provided "AS IS" with no warranties, and confers no rights. We have now carried out a large number of tests and now believe that the
problem is with the recipients server. We just need to convince them that it is their end. Since there is nothing wrong with our ASP.NET code, this question can be closed. Thank you for your help. Show quote "Walter Wang [MSFT]" wrote: > If you use other email client to send email from domain W to domain A, does > this issue also occur? > > You may also try to compare the MIME header in the email that failed to > send from W to A, with the email that is successfully sent to A from B or H. > > Regards, > Walter Wang (waw***@online.microsoft.com, remove 'online.') > Microsoft Online Community Support > > ================================================== > When responding to posts, please "Reply to Group" via your newsreader so > that others may learn and benefit from your issue. > ================================================== > > This posting is provided "AS IS" with no warranties, and confers no rights. > >  |
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