Royal Mail will be resuming its International Tracked and Signed, and International Signed services to all destinations for business account customers and customers buying postage online from Jan. 26, the company said in an update posted on its website.

Parcel, large letter and letter formats of these services will be restarted, said the company, which is part of London-listed International Distributions Services Plc.

"We have made further progress in exporting an increasing number of items to a growing number of international destinations. We are using alternative solutions and systems, which are not affected by the recent cyber incident," Royal Mail said.

Royal Mail, one of the world's largest post and parcel firms, started to move limited volumes of export parcels last week, following an announcement on Jan. 11 that its international export services was severely disrupted by a cyber incident.

(Reporting by Muvija M; editing by William James)