smtp-user-enum

smtp-user-enum is a Python-based tool designed for SMTP user enumeration using commands like `VRFY`, `EXPN`, and `RCPT`. Its notable features include granular timeout management, automatic reconnection capabilities upon encountering errors, and flexible customization options for input formats, making it effective for identifying valid email addresses and their aliases. This tool is inspired by a Perl script and supports both Python 2 and Python 3.