I'd like to help you out with that problem! I will need specifics in order to help you out. What device do you have? Do you possibly have a signature enabled on the device which prevents it from sending the message? What type of message is this (picture, video, or text)?
I'm happy to help you further, I just need some more info.
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Hi. I have a Samsung Alias 2. I am trying to forward a plain text message. I don't think I have anything enabled or disabled that would cause this. I bring up the message. select options, forward, Put in the e-mail address and it immediately says "cannot send the attached object to email address". I don't understand.
SMS-toEmail is only supports up to 160 characters which includes the destination email address. If you try to send 160 or more characters then you get that poorly-worded message.
As an example, if you were trying to forward a text to email@example.com then you would have only 133 characters remaining since firstname.lastname@example.org uses 26 characters of the available 159 characters.
If the text you are trying to forward is over 159 characters then you need to edit the text into shorter pieces.