Embedding HTML in messages

As soon as I embed HTML in a message the OPENFIRE server generates an error as follows::

org.xmlpull.v1.XmlPullParserException: entity reference name can not contain character =’ (position: START_TAG seen …s://www.meboptions.com/cToTrade/default.aspx?OID=MEB-00000148&UID=… @1:477)

How are you suppose to embed HTML in a message with the openfire server - for example what I am trying to include in the message is the following

[Click here for account]

Anyone got any ideas?