- How to get your IP or domain removed from Spamhaus Find out which Spamhaus list you're on, fix the cause, and request removal the right way. Step by step, with what each list means.
- How to open and convert HEIC photos on Windows iPhone photos come as HEIC, which Windows can't open out of the box. Three ways to view them or turn them into JPG, free.
- SPF, DKIM and DMARC explained: how to set them up What SPF, DKIM and DMARC do, the records to add for each, and how to check them. Required by Gmail and Yahoo for bulk senders.
- How to warm up a new email domain or IP address Why new domains land in spam, how fast to raise your sending volume, and what to watch while you do it.
- How to extract the audio from a video (MP4 to MP3) Save the sound from a video as an MP3 or WAV: for lectures, interviews, podcasts and music you recorded. Free, in your browser.
- How to reduce a video's file size for WhatsApp or email Make a phone video small enough to send by WhatsApp or email: lower the resolution, pick a smaller quality and trim it. Free, in your browser.
- Why your emails go to spam: a checklist The usual reasons emails land in spam, in the order to check them: blocklists, SPF, DKIM, DMARC, sending volume and content. With free tools for each.
- How to convert WhatsApp voice notes to MP3 WhatsApp voice notes are Opus or OGG files that many players can't open. How to save them from Android or iPhone and turn them into MP3.
- PNG vs JPG vs WebP: which image format should you use? When to use PNG, JPG or WebP: photos, screenshots, logos and websites. What each format is good at, with free converters between them.
- How to fix "SPF permerror: too many DNS lookups" SPF records may use at most 10 DNS lookups. What counts towards the limit, how to find what's using them, and five ways to get back under it.
- How to make a favicon from a PNG Turn your logo into a favicon.ico for your website: what size to start from, how to convert it, and the HTML to add so every browser shows it.