Duplicates in outbound are expensive twice: once in credits and once in credibility, because the same person receiving two different sequences from you is the fastest way to look automated.
Where duplicates actually come from. Almost never from a single search. They come from overlapping lists and repeated exports:
- Two saved lists whose filters overlap, for example one by industry and one by keyword that both catch the same companies.
- A list exported again later, after the market has moved, and both files loaded into the same sending tool.
- Country lists that overlap with a region shortcut covering the same markets.
How to keep it clean:
- Make your segments mutually exclusive. If two lists could catch the same company, add an exclusion or split by size or geography so they cannot.
- Dedupe on email address at import. Every serious sending tool can do this, and the email address is the reliable key.
- Keep a master suppression file of everyone you have already contacted, and check new exports against it before loading them.
- Name lists consistently so overlap is visible on the Lists page rather than discovered in a reply.
The habit worth building is treating the sending tool as the place where suppression lives, and Argorant as the place where segments live.