Roman Kozłowski

TL;DR: SMS deliverability is not a single number. It is the ability of a communication system to successfully get text messages to recipients' devices, shaped by...

Every email you send passes through an SMTP server, and every SMTP connection starts with a port number. If you pick the wrong one, your messages may fail with no...

Sending email to a hundred people is fairly easy. Sending it to ten thousand or more and having it actually arrive in their inboxes is a broader infrastructure challenge. A...

A lot of email marketing strategy advice you see reads like it was written for someone who already has a functioning program – segment your list, optimize your...

Your professional email address can show up even before your subject line. In a cold outreach, a support reply, or an invoice, it's the first thing the recipient...

A public 10DLC URL shortener can block your SMS campaign before the first message goes out. In US A2P messaging, public shorteners such as bit.ly or tinyURL can...

Branded links in SMS, RCS, and Viber do not work as one identical UX pattern copied across channels. The same branded short domain can appear as plain text in SMS,...

Two SMS messages. Same product, same offer, same copy. One ends with bit.ly/x9Za The other ends with go.brand.co/offer That difference is the business case for...

Deferred deep linking used to sit in silence behind many mobile growth journeys. A user tapped a link in an SMS, RCS, or Viber message, installed the app, and arrived...