As of Monday 16 July 2012 Canada Post has been withdrawing regular services from parts of downtown Ottawa.
Our building, a 21 story office block continaing four embassies and numerous business, now gets postal deliveries at the end of the business day, or even later. A couple of days ago the post arrived at 17:10 after the facility was locked. Canada Post tells us this will be in palce on an irregular basis for the next two weeks, and will then become engraved in stone.
So if you want your passports to arrive on time, or you want fast services, please use PUROLATOR or FEDEX courier systems.