Question

Message Truncated when using System.Web.Mail.MailMessage

Asked by: CUTTHEMUSIC

I have code in an ASP.NET page that sends an email with some attachements. I've found that depending on how long the message body is some or most of the message is truncated. I've breifly remember hearing about this problem and I think it pertains to permissions on a temp folder that ASP.net uses to create the message before sending it but I am not sure. Have any of you guys had this problem? My code for sending out the message is nothing fancy, it simply creates the message attaches a file and sends it out.

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Asked On
2006-08-30 at 12:30:33ID21973077
Topic

Programming for ASP.NET

Participating Experts
1
Points
350
Comments
9

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Answers

 

by: ggoodwin81Posted on 2006-08-30 at 12:38:38ID: 17423415

This is caused by a strict adherance to RFC 2822 standards. According to the RFC, no single line should be longer than 1000 characters (actually 998 characters, plus the 2 for the CrLf break). Some of the older gateways and server strictly enforce this rule, while most of the newer mail server implementations allow lines longer than 1000 characters. Typically, people will experiance this problem when sending HTML email, because of long, unbroken HTML lines.

I recommend you set the MailEncoding.QuotedPrintable format for the EmailMessage.ContentTransferEncoding property. This will cause your email to have soft CRLF line breaks every 72 characters. When the email client decodes the message, the original line breaks will have been preserved.

 

by: CUTTHEMUSICPosted on 2006-08-30 at 12:48:30ID: 17423489

Sounds good but could you explain how I do that?

 

by: ggoodwin81Posted on 2006-08-30 at 12:52:40ID: 17423527

These are the differant types.


cdo7bit                   "7bit"                   Simple 7-bit ASCII
cdo8bit                   "8bit"                   8-bit coding with line termination characters
cdoBase64              "base64"              3 octets encoded into 4 sextets with offset
cdoBinary               "binary"                Arbitrary binary stream
cdoMacBinHex40     "mac-binhex40"     Macintosh binary to hex encoding
cdoQuotedPrintable "quoted-printable" Mostly 7-bit, with 8-bit characters encoded as "=HH"
cdoUuencode          "uuencode"           UUENCODE encoding.

I would try this.
MailObject.ContentTransferEncoding = "base64"

 

by: ggoodwin81Posted on 2006-08-30 at 12:55:06ID: 17423541

ok I should specify even more sorry about that.

MailObject.IBodyPart.ContentTransferEncoding = "base64"

 

by: CUTTHEMUSICPosted on 2006-08-30 at 13:02:17ID: 17423601

I get 'IBodyPart' is not a member of 'System.Web.Mail.MailMessage'.

 

by: ggoodwin81Posted on 2006-08-30 at 13:08:31ID: 17423665

Sorry you would reference

System.Web.MailMessage.BodyEncoding = System.Text.Encoding.UTF32

I am off today.

 

by: CUTTHEMUSICPosted on 2006-08-30 at 13:13:28ID: 17423706

UTF32 is not an option. The suggest list in Visual studio gives me
ASCII
BigEndianUnicode
Convert
Default
GetEncoding
Unicode
UTF7
UTF8

 

by: CUTTHEMUSICPosted on 2006-08-31 at 07:59:11ID: 17429472

Wasn't the exact fix but got me on the right track. Thanks for your help.

 

by: ggoodwin81Posted on 2006-08-31 at 11:14:17ID: 17431190

Sure sorry I couldn't nail it exactly.
Glad you got it figured out.

20120131-EE-VQP-002

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