Open rates on marketing e-mail and newsletters dipped in Q4 of 2005, according to the "Q4 2005 E-mail Statistics" report released by eROI.

From the Q3 to Q4 2005, open rates dropped 29 percent. Click rates fell 21 percent in the same period. The report speculates image blocking in Gmail, Outlook 2003 and other e-mail clients chipped away at open rates. The sheer volume of e-mail received over the holidays is another factor considered by the e-marketing agency.

The study finds Friday to be the best day to send e-mail. The past two quarters show a tendency for higher open and click rates on Friday. Tuesday gets the second-highest open rate, with Thursday earning the second-highest clickthrough rates.

E-Mail Read and Click-Through Rates by Day of the Week, Q4 2005
	Sent	Open (%)	Click (%)
Sunday	5,011,265	14.7	3.5
Monday	23,303,132	14.3	2.7
Tuesday	19,891,083	20.8	3.7
Wednesday	22,220,590	19.5	3.6
Thursday	21,565,988	20.0	3.7
Friday	16,313,851	21.0	4.0
Saturday	3,493,336	13.0	2.5
Source: eROI Inc., 200

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