Mimecast

gateway 🇬🇧 GB

UK-origin enterprise email security gateway (Permira-owned).

9,296SPF-authorising domains

1.492%of all SPF domains in Tranco top-1M

205distinct TLDs

2026-04-28snapshot date

Historical Share

com — 5,511 (59.3%)

org — 770 (8.3%)

co.uk — 551 (5.9%)

com.au — 309 (3.3%)

co.za — 257 (2.8%)

net — 182 (2.0%)

org.uk — 144 (1.5%)

de — 123 (1.3%)

edu — 104 (1.1%)

fr — 86 (0.9%)

gov — 86 (0.9%)

ca — 78 (0.8%)

nl — 58 (0.6%)

gov.uk — 53 (0.6%)

co.nz — 49 (0.5%)

ie — 40 (0.4%)

io — 40 (0.4%)

org.au — 34 (0.4%)

it — 32 (0.3%)

eu — 28 (0.3%)

edu.au — 26 (0.3%)

us — 26 (0.3%)

org.za — 25 (0.3%)

gov.za — 25 (0.3%)

be — 25 (0.3%)

es — 25 (0.3%)

ac.uk — 22 (0.2%)

ae — 20 (0.2%)

se — 17 (0.2%)

com.br — 17 (0.2%)

Showing 100 of 9,296 domains. Sample sorted by length (shortest first).