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When email is sent using Mail.app a Apple Mail (x.xxx.x) X-Mailer header is added to the message. Is there a way to determine which actual version of the app was used to send the messages? In Lion Version 5 the header is (2.1244.3).

Is there some sort of formula that determines what the numbers in the header are? Is there any way to determine the version mappings from older versions?

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  • So means X-Mailer: Apple Mail (2.1085) is Mail 4.3x and running on Snow Leopard OS ? – user33496 Oct 25 '12 at 13:55
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Simple answer - no, there is no easy way to tell from just the number.

However, I did a Google Image search for screenshots of the "About Mail" window, and found the following correlations between Mail version numbers.

  • Mail 5.2 = 1257
  • Mail 5.0 = 1244
  • Mail 4.3 = 1081
  • Mail 4.0 = 1075
  • Mail 3.6 = 936
  • Mail 3.5 = 930
  • Mail 3.4 = 928
  • Mail 2.1 = 752

If you're wanting to match to versions of the OS:

  • Lion: 12xx
  • Snow Leopard: 10xx
  • Leopard: 9xx
  • Tiger: 7xx

"About Mail" images found on these (and other) pages:

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