Mass Email Content Missing

My mass email seems to work but I noticed that the complete content of the email/text is not being sent in full.

I tried using different approach (like entering html with double/single quote code, plain text, etc) but still the text/content cuts in half or most of the content/text are missing/removed when you received the email.

When you added a message in a queue and preview it, you will see its text/content incomplete.

Anybody here encountered such issue and how to fix it, please advise.

Thanks. 

As for me (Dolphin 6.1.1) Mass Email (or Admin Email) don't allow me to use simple or double quotes in the message content.

HTML messages containing images or links are sent and recieved just fine without using any quotes or double quotes... For example, I have to write do not and not don't, a href=http://domain.com, img src=http://domain.com/images/xxx.jpg, etc...