If you receive mail from a member but would prefer not to reply, there is a Create 'no thanks' message button. This generates a polite message addressed to the sender (which you may edit if you wish), thanking them for their message but declining further contact.
If you'd like to stop receiving messages from a particular member, you can block them using the Block this member link on their profile. If you do receive mail which you find inappropriate in any way, use the Report this message link on the relevant message.
If the same member is blocked several times, they may have their membership suspended.
Please don't block other members routinely or excessively. Blocking should be used carefully. Members who block excessively can cause confusion and may have their membership reviewed.