Following are some tips for posting ads on craigslist over and over again:

1) Unique Email address: Use a different email address for each posting.

2) Different Ad Descriptions: You need to change the ad description each time to avoid "similar posting" error and staff deletion.

3) IP Address: Change your IP as frequently as possible. If a lot of ads are posted using a single IP then it is blocked for few hours to few days, even permanently if abused recurrently. It seems postings from foreign IPs are auto-deleted by craigslist software.

4) Titles: Titles should match with category. Using a lot of different titles are also helpful. Particularly, it reduces user flagging. And obviously user flagging leads to staff deletion.

5) Don’t post more than 10-20 ads at a time. Give some time gap between each batch of postings.

6) Select your posting category properly. Postings on wrong categories are flagged and deleted so quickly.

7) To get maximum benefit select your posting time carefully. Do some research to determine approriate time for your business.

8) Don't post too many ads too frequently. Over exposure is not a good idea.

9) If your ads are flagged so frequently then make your ads more natural looking. Too much commercial looking ads may be flagged so frequently unless you are posting under "services offered" category.

10) Finally, avoid using a particular word or phrase (may be company name, phone number or email address etc...) in your titles or ad descriptions.