Python on Servicios Rogeliowar

AUTH LOGIN manual in Python with smtplib: special characters and error 535

Mon, 04 May 2026 00:00:00 +0000

The Problem
#

A few days ago I tried to automate sending emails from my home server. Nothing complicated: a Python script with smtplib to send notifications. The problem came when I configured a password with special characters: MiPasw0rd$Ñ.

import smtplib

server = smtplib.SMTP('mail.example.com', 587)
server.starttls()
server.login('usuario@example.com', 'MiPasw0rd$Ñ') # Error 535

Result: SMTPAuthenticationError: (535, b'5.7.8 Authentication credentials invalid')

The strange thing is that the password was correct. I could access it manually without problems. Error 535 suggested authentication failures, but the real problem was in the encoding.

Smart Excel Import in Python: Flexible Column Detection and Heterogeneous Data Cleaning

Mon, 04 May 2026 00:00:00 +0000

I’ve been working with Excel spreadsheets that arrive from different departments. Each one uses different column names, the data is dirty (phone numbers with notes, tax IDs mixed with text), and codes have inconsistent formats. Here I document the solution I built.

The real problem
#

I was receiving Excel files where:

Columns called “NIF” in one, “CIF” in another, “Identification” in the third
Phone numbers like “123-456-7890 (ext 5)”, “9876543210 - unavailable”
Tax IDs with dashes, spaces and varied letters
Product codes with inconsistent prefixes

I couldn’t expect everyone to format the same way. I needed a system that was flexible.

Python on Servicios Rogeliowar

AUTH LOGIN manual in Python with smtplib: special characters and error 535

The Problem #

Smart Excel Import in Python: Flexible Column Detection and Heterogeneous Data Cleaning

The real problem #

The Problem
#

The real problem
#