At its core, an is a plain text document (saved with a .txt extension) that contains a collection of email addresses. Unlike Excel spreadsheets ( .xlsx ) or CSV files ( .csv ), a plain text file has no formatting, no columns, and no macros. It is raw data.
Most email clients (Gmail, Outlook) and marketing platforms allow you to import a .txt file. email list txt file
Invisible spaces are the silent killers of email lists. An address like " john@doe.com " (with a space before or after) is technically invalid. Most email servers will reject it, and verification tools will flag it as an error. At its core, an is a plain text document (saved with a