Mailing time gap duration

[anush]

What is the often time span do you guys think is good, for email marketing?

[Paul]

If you are mailing your clients who have subscribed to your readership then I will suggest that you mail them once in a week.
Try to offer them information rather then just giving them the link to buy or visit something.

[brian]

What is the often time span do you guys think is good, for email marketing?

In my case its twice a week.

[zeus]

If you are giving any reminder then once a week, if you are sending a/many product reviews then twice a week and if you are mailing about your updates in your site then 3-4 times a week.