The phrase "an email dated" is correct and usable in written English.
It can be used when referring to a specific email that was sent on a particular date.
Example: "I received an email dated March 5th regarding the upcoming meeting."
Alternatives: "an email from" or "an email sent on".
In an email dated December 16th 1993, a Microsoft technologist noted that "Internet connectivity . . .
"Let's just make it a hit," Clooney wrote in an email dated 29 January.
"This is now a story of Americans changing their movie to make North Koreans happy," he complained, in an email dated 15 August.
"I think we need to highlight people like Glenn Greenwald," writes Aaron Barr of HBGary in an email dated 3 December 2010 and reproduced on salon.com.
These included an email dated 13 September 2002 "covering a copy of a Bush speech to compare with UK dossier claims".
In an email dated 28 May 2014, Crawford wrote, "As a reminder, you are all still under contract until July 13th … The responses I've been getting so far for summer events have been terrible.
In a separate email, dated 24 January 2006, Goodman chased payment for a source who, the jury have been told, was a police officer whose identity was concealed by a false name: "I'm afraid Mr Farish is a cash-only contributor because of his extremely sensitive job.
In a separate email, dated 1 August, "unflattering moments for the NFL" were described as having been deleted or changed, according to the Times.
Subsequent to that meeting, Monsanto did send over some data, and in a follow-up email dated April 18 , 2016 an EPA scientist sought clarification about what to look for.
It includes a redacted copy of an internal FCO email, dated 18 April 2012.
Dodd's trove of cardboard boxes stuffed with the company's records included a now famous email dated 26 September 2000 from Jay Bly, a former secret service agent working for BBI, to Tim Ward, the former Maryland state trooper on the payroll: Received a call from Ketchum yesterday afternoon re three sites in DC.
