Tony Finch

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In these notes I explain how to derive formulae for numerically stable calculation of the mean and standard deviation, which are also suitable for incremental on-line calculation. I then generalize these formulae to weighted means and standard deviations. I unpick the difficulties that arise when generalizing further to normalized weights. Finally I show(More)
The QUICKSTART SMTP service extension (full profile) draft−fanf−smtp−quickstart−b Status of this Memo By submitting this Internet−Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of(More)
SMTP service extensions for transaction checkpointing draft−fanf−smtp−rfc1845bis Status of this Memo By submitting this Internet−Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of(More)
One of the more vexing problems with the lack of security in Internet email is ''collat-eral spam'': the backscatter of bounces from forged email that is sent to the forged address. The effect of this is for users to ignore bounces as just another kind of spam, and evenf or some email system administrators to disable bounces altogether.S oa sw ell as being(More)
Exim was originally written nearly 10 years ago for use on the email servers at the University of Cambridge, and our requirements still have significant influence on Exim'sd ev el-opment. Our central email systems provide a number of message transport services, including ageneral-purpose smarthost, an authenticated message submission service usable by(More)
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