If more than one submits to the same search engine, you may be knocked off for abuse. If you see repeated searches, check for an option of not submitting to those searches. However, if the site is automatic, you may not have that choice. In this case, list the ones you haven t been submitted to and see if it is worth your while to submit your site manually. Review the searches you are paying to be submitted to.
Some services offer higher numbers by submitting to searches in foreign countries.
Some search engines, such as AOL, require for a business to manually list on their site. In this instance you must find the category that your best fits your business and submit it from that page for review. All search engines usually limit how often you submit your site. Submitting every day will only get your site kicked off. Most seem to suggest that you resubmit every 3 weeks.