But the Communication Workers Union has said it is consulting its legal team and plans to go ahead with the march, even it bypasses Sapo buildings.
On Wednesday, any worker who wants to go on strike, can do so. Every town across SA is being urged to join the first of two protected mass strikes.
As letters and parcels continue to pile up in post offices across South Africa, there appears to be no end in sight to the long-running strike.
ANC secretary general Gwede Mantashe faced farmers' questions about land reform, food security, labour unrest and agricultural policy inconsistencies.
The finance minister said government is committed to lowering the budget deficit but a sluggish economic growth outlook will present a challenge.
Industry body Seifsa is said to be meeting with Numsa on Wednesday morning to discuss a wage agreement.
North West Premier Thandi Modise will lead a provincial delegation to meet Anglo American Platinum management on the proposed closure of four shafts.
Anglo American Platinum miners have ended a wildcat walkout and want talks to prevent further action against the number one producer of the metal.
As Gold Fields announced its operations resumed, another operator said it was hit by a strike, suggesting labour unrest in the mines is far from over.
As the labour crisis in the mining sector escalates, all eyes have turned to the government to take the lead in preventing financial and job losses.
The government has lost patience with state worker unions, breaking off wage talks with Cosatu, which has been seeking above-inflation pay increases.
Striking Impala Platinum mine workers say they "cannot survive" on the salaries they are paid, demanding "R9 000 and nothing else" from the company.
One person has been killed in clashes with striking miners outside Impala Platinum's Rustenburg operations.
Cosatu has called on teachers to lead a strike its members will hold in a month's time against labour brokers and proposed toll roads in Gauteng.
Police officers are now not allowed to use rubber bullets or shotguns on protesters after reports of excessive violence being used on demonstrators.
The chamber of commerce and industry says the impact of an illegal KwaZulu-Natal toll plaza strike will impact the transportation of goods.
The DA-run Western Cape has seen the worst of Samwu's strike violence while Gauteng has remained largely unscathed. We look at the tale of two cities.
SA's labour legislation is correct, but the political leadership to implement it is lacking, says Anglo Gold Ashanti chairperson Tito Mboweni.
Samwu and the NUM are continuing their strikes against their employers, leaving services, electricity supply and mining output in the lurch.