Please take a chance to read the Classified Rulesthere’s some advice in there.
We don’t offer a PM, you can easily setup an email account using providers such as Gmail if you do not wish to use your normal email.
If you chose not to do Paypal then as others have said a bank transfer is very quick and provides little more details than a personal cheque does.
As for postage, most people expect a reasonably quick response some stupidly quick. If you think there will be a delay then explain in your communication.
But you do need to post an email on the forum then which lots of folks are wary about.
If you look most people use different tricks to slow the chances of bots picking up the email. Seems to work very well for me, mine is the only published email I have and receives the least spam.