"Subsequent correspondence" refers to any communication that happens after an initial contact or letter. It includes follow-up emails, letters, or any other messages that occur later in a conversation or exchange. Full definition
The statement added, «It should be recalled that in subsequent correspondences particularly with the Acting President and the International community since the «Kaduna Declaration», our Coalition has maintained that the conspiratorial silence of all the Igbo, especially all their political, cultural and religious leaders was responsible for emboldening the unpatriotic and violence - prone actions of the Indigenous Peoples Of Biafra, IPOB, and its leader Nnamdi Kanu. (dailypost.ng)
We understand that in subsequent correspondence HMRC has confirmed that the reference to there being an existing obligation to inform BEIS is also incorrect and that that won't be the case until 2021. (burges-salmon.com)
In response, Science deputy editor Andrew Sugden says, «Our understanding at the time of publication and in subsequent correspondence was that the specimen was accessible at the museum, as stated at the end of the paper.» (sciencemag.org)