Sentence:  Don't <WSD>oversend</WSD>. That means don't send an e-mail announcement to everyone who may have once sent you an e-mail; it also means don't overburden those who are willingly on your e-mail list because they want relevant information. <WSD>Oversending</WSD> e-mails is the surest way to be ignored or find your way to the junk mail file. 
Meaning of the word marked with <WSD> tags:  To send to too many people.