: TXT files can be opened and edited on any device (Windows, Mac, mobile) without specialized software .
| Disadvantage | Detail | |--------------|--------| | | Cannot store names, signup dates, or custom fields alongside emails. | | No deduplication by default | Duplicate emails are not automatically removed. | | No validation | Syntax errors (e.g., user@domain ) are not flagged. | | Large lists become messy | For 100k+ emails, managing manually is impractical. | | Not directly usable in most email platforms | Services like Mailchimp, Constant Contact, or SendGrid require CSV/XLSX or API uploads. | email list txt file