Web Wiz Forums Suggestions - Lone CR in Signature

Lone CR in Signature

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URL: https://forums.webwiz.net/forum_posts.asp?TID=28666
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Topic: Lone CR in Signature

Posted By: Find-Relation
Subject: Lone CR in Signature
Date Posted: 23 June 2010 at 11:40am

Hi Web Wiz Forums Developers

The last weeks this error has occured daily, when email notification is sent to users using mail-server fpo.mail.dk.

host fpo.mail.dk[80.160.76.237] said: 550 5.6.0 Lone CR
or LF in body (see RFC2822 section 2.3) (in reply to end of DATA command)

Action: failed
Status: 5.6.0
Remote-MTA: dns; fpo.mail.dk
Diagnostic-Code: smtp; 550 5.6.0 Lone CR or LF in body (see RFC2822 section
2.3)

This is probably the reason:
When a user has more than 1 line in the signature, the line-change is stored with these characters - chr(x):

chr(13)
< chr(60)
b chr(98)
r chr(114)
chr(32 )
/: chr(47)
>: 62

The same problem does'nt exist in a Thread-message, where the line-change correctly has a LF - chr(10) - just after chr(13).

Can you fix that problem in the next version, before other mail-servers get the same idea, and reject mails without LF (or CR).

Replies:

Posted By: Find-Relation
Date Posted: 23 June 2010 at 11:12pm

WebWiz-Bruce wrote:

This might be a bit difficult as the forum code does not put any Carriage Returns or Line Feeds into signatures. If there are any the these would be put in by the web browser when the person writes their signature and more than likely only certain browsers, so would need to know which browser.

Hi Bruce

Please check these code-lines:

strSignature = FormatPost(strSignature)

functions\functions_format_post.asp:
Private Function FormatPost(ByVal strMessage)
strMessage = Replace(strMessage, Chr(10), "<br />", 1, -1, 1)

You're right - the code does not put Carriage Returns or Line Feeds into signatures, but as you see, the code removes Chr(10) from the signature.

strMessage = Replace(strMessage, Chr(10), Chr(10) & "<br />", 1, -1, 1)

might be a better solution to prevent the mentioned error from the mail-server.

-------------
Regards Ole Dalsgaard Jensen

Posted By: WebWiz-Bruce
Date Posted: 24 June 2010 at 8:53am

Mail servers that reject emails due to a lone CR or LF was due to an Outlook vulnerability form over 5 years ago that was never exploited and was patched along time ago.

Mail servers rejecting emails based on lone CR and LF fell out of favour along time ago as it blocked quite a high percentage of legitimate emails as about 1 in very 50 emails have a lone CR or LF in the header.

I would recommend contacting the mail server admin and let them know they are preventing legitimate emails from coming through.

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