Liverpool aren't posting any either, they have to collect from anfield, not Wembley.
Here you go… Postage and delivery of tickets
Supporters whose address on our ticketing system falls within the UK including Northern Ireland - tickets will be sent via Special Delivery and an additional charge of £6.45 will be applied per transaction at the time of booking.
Tickets will be sent to the registered address we currently hold on our ticketing system of the person making the booking.
We cannot accommodate tickets being sent to an alternative address or requests for collections.
Supporters whose address on our ticketing system falls outside of the UK including Northern Ireland - due to the short timescales involved and the uncertainty around tickets arriving ahead of the match, all non-UK supporters must collect their tickets from Wembley Stadium on the day of the semi-final.
Tickets will be available for collection for these supporters from the East Side ticket office from 9am until 2pm only. We will be unable to accommodate any collections outside of these hours. Full ID will be required in the form of passport or driving licence along with a copy of your email confirmation before tickets will be issued. We will not issue your tickets if valid ID is not provided. http://www.liverpoolfc.com/news/announcements/fa-cup-semi-final-ticket-details
That collection is for non uk residents, also the article was posted on the 2nd of april? I'm guessing this is wrong as they only replayed Blackburn on the 8th?
The latest article states they are not posting any and they must collect from anfield.