Web hosting in Portugal — directory

Technique

Reverse DNS: the detail that weighs on email deliverability

SPF and DKIM are green, yet mail lands in spam: PTR does not match HELO. This invisible detail weighs heavily at major filters.

Technique

ACME: monitor certificate renewal before expiry

Certbot "always worked" — until silent renewal failed because DNS changed and nobody monitored certificates, only HTTP uptime checks.

Technique

HTTP/2: what multiplexing really changes for web assets

HTTP/2 fixes six parallel TCP connections — not twelve synchronous scripts blocking render. Multiplexing helps; it does not replace front-end optimization.

Related guides & analyses

Reverse DNS: the detail that weighs on email deliverability

ACME: monitor certificate renewal before expiry

HTTP/2: what multiplexing really changes for web assets

See also