stripping out \"+\" in email addresses

stripping out \"+\" in email addresses

I use gmail to archive files by appending a "+file" to the username portion of the address. So, instead of "myname@gmail.com" the address looks like "myname+file@gmail.com". This allows me to write a filter that then adds a gmail label to the message and immediately archive it. When emailing a document from Zoho Writer, the "+" is stripped from the address. Can anything be done to stop the mail agent from doing this?
riverphot