Please see below that I have found

"Drag-drop outlook email or Copy-paste mail does not work when subject contains too many characters"

e.g.

Please find below subject line ( i.e. in Italic font) of the email. The emails with large subject line as below creates problem in drag-drop and copy paste.

RE: Development Sign
off Athena 1216 :GrossTradeComm and Principal column chooser& Athena 1221 :
Automatic trading account's open date must be beginning date of year of trade
date & Trading account's Reassign Open date must be greater than Existing
open

If there are some limitation for number of characters in Subject line due to above is not working then Microsoft should put restiction on the length of subject line.

Please ignore if this is already raised by someone.

• Moved by Fei XueMicrosoft contingent staff 22 hours 32 minutes ago

Hello Sudhir,

I couldn't reproduce the issue on my machine with Outlook 2013 installed.

As for the length of the subject line, Outlook doesn't provide any limitation on the string. But the RFC 2822 does. The What is the email subject length limit? forum thread states the following:

There are two limits that this standard places on the number of characters in a line. Each line of characters MUST be no more than 998 characters, and SHOULD be no more than 78 characters, excluding the CRLF.

As the RFC states later, you can work around this limit (not that you should) by folding the subject over multiple lines.

Each header field is logically a single line of characters comprising the field name, the colon, and the field body. For convenience however, and to deal with the 998/78 character limitations per line, the field body portion of a header field can be split into a multiple line representation; this is called "folding". The general rule is that wherever this standard allows for folding white space (not simply WSP characters), a CRLF may be inserted before any WSP. For example, the header field:

       Subject: This is a test

can be represented as:

       Subject: This
        is a test

The recommendation for no more than 78 characters in the subject header sounds reasonable. No one wants to scroll to see the entire subject line, and something important might get cut off on the right.

• Edited by Eugene Astafiev Thursday, March 05, 2015 6:06 PM

Hi Sudhir,

According to your description, this issue is related to Outlook instead of outlook development. We will move it to Outlook IT Pro Discussions forum for better response.

Regards

Starain