Protect Existing Data in Excel While Still Allowing New Entries
Let people add rows to a shared workbook but stop them from changing or deleting what’s already there – with sheet protection…
Conocimiento
Guides & Tips
Guías prácticas y probadas sobre Windows, Linux, redes, servidores de correo y WordPress – escritas a partir del soporte real.
Daily Postfix Mail Reports with pflogsumm
Turn /var/log/mail.log into a readable summary of deliveries, bounces, rejections and warnings – and email it to yourself every morning.
Brand Roundcube Webmail per Domain on a Shared Mail Server
Hosting several mail domains on one Roundcube install? Show each customer their own logo, chosen automatically from the webmail address they visit.
Style the WordPress “Post Comment” Button with CSS
Change the colour, size and hover effect of the comment form’s submit button with a few lines of CSS – no plugin…
Customise the WPForms Submit Button with CSS
Restyle the WPForms submit button – size, colours, border and hover – with a short CSS snippet that survives plugin updates.
Host Multiple WordPress Sites on One Ubuntu LEMP Server
Run several WordPress sites on one Nginx, MySQL and PHP-FPM server – each with its own server block, database, user and free…
Install and Configure Postfix on Ubuntu: The Essentials
Install Postfix as an Internet Site, understand the main.cf settings that matter – myhostname, mydomain, mydestination – and verify it’s running.
Why I Moved My Mail Servers from Exchange to Postfix and Dovecot
Building a Linux mail server on Ubuntu with Postfix, Dovecot and MySQL – and how proper SPF, DKIM and DMARC took deliverability…
Exchange “Year 2022” Bug: Mail Stuck in Queues (FIP-FS) – Workaround and Fix
On 1 January 2022, on-premises Exchange servers stopped delivering mail because the malware-scanning engine couldn’t read its own version number. Here’s the…