Whilst grateful for the unblock, I do not accept that pointing out that a fellow editor has involved third parties, and posted private email correspondence constitutes "unwarranted attacks".

Regardless of the number of edits that he has made, this is a clear case of double standards, whereby a long term editor can get away with this, and I, a lesser editor can not.
He has clearly not complied with the Wikipedia policy I repeat below. 

"Off-wiki attacksWikipedia cannot regulate behavior in media not under the control of the Wikimedia Foundation, but personal attacks made elsewhere create doubt as to whether an editor's on-wiki actions are conducted in good faith. Posting personal attacks or defamation off-Wikipedia is harmful to the community and to an editor's relationship with it, especially when such attacks take the form of violating an editor's privacy. Such attacks can be regarded as aggravating factors by administrators and are admissible evidence in the dispute-resolution process, including Arbitration cases."

He took this outside Wikipedia, not me. He should also be penalised, apologise to the third party, and withdraw his cyber squatting with our private email.