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Email sizes 2003-2009

I recall some research MessageLabs did around 2003 that said email sizes averaged less than 20k, in fact maybe the number was 16k.

Anyway about  a year ago I took a look back over 2008’s data and we were seeing an average size of about 30k, the same view this year and I see that the average size of an email is now around 70k for outbound email and 200k for inbound email.

So that looks like an 85k average email size to me which is fair jump from 2003’s 16k. Note that these numbers are after the spam filters so we don’t get the numbers messed up by spam.

I’d be interested to hear from any other organisations on the sizes they are seeing.

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