FastMail (sender)

mailbox 🇦🇺 AU

FastMail outbound SPF for hosted custom domains.

1,682SPF-authorising domains

0.27%of all SPF domains in Tranco top-1M

162distinct TLDs

2026-04-28snapshot date

TLD Distribution (top 30 of 162)

com — 776 (46.1%)

org — 179 (10.6%)

net — 167 (9.9%)

io — 68 (4.0%)

me — 23 (1.4%)

co.uk — 23 (1.4%)

app — 22 (1.3%)

tv — 22 (1.3%)

co — 19 (1.1%)

de — 17 (1.0%)

dev — 17 (1.0%)

ru — 15 (0.9%)

com.au — 14 (0.8%)

nl — 12 (0.7%)

ca — 10 (0.6%)

ai — 9 (0.5%)

one — 9 (0.5%)

social — 9 (0.5%)

us — 8 (0.5%)

eu — 8 (0.5%)

pro — 7 (0.4%)

com.br — 6 (0.4%)

cc — 6 (0.4%)

it — 5 (0.3%)

info — 5 (0.3%)

se — 5 (0.3%)

gg — 5 (0.3%)

pl — 5 (0.3%)

fm — 5 (0.3%)

club — 4 (0.2%)

Showing 100 of 1,682 domains. Sample sorted by length (shortest first).