DNS & authentication
SPF, DKIM, DMARC explained. How InboxLee applies them. How to verify manually.
SPF records for cold email senders
What SPF does, why you need exactly one, the common errors, and what InboxLee sets.
5 min read·Updated Apr 15, 2026
DKIM explained - 2048-bit keys, rotation, verification
How DKIM works, why InboxLee uses 2048-bit keys, how rotation happens.
6 min read·Updated Apr 12, 2026
DMARC policy guide - none vs quarantine vs reject
What DMARC policy to set for cold outreach. Why InboxLee defaults to quarantine.
5 min read·Updated Apr 10, 2026
MX records - why senders still need them
MX is for inbound, but cold senders without MX get penalised anyway.
4 min read·Updated Apr 6, 2026
CNAME flattening at the apex
Why some registrars break DKIM with CNAME flattening, and how InboxLee handles it.
3 min read·Updated Apr 3, 2026
DNS propagation timeline
How long propagation actually takes, and why InboxLee polls until verification.
4 min read·Updated Mar 28, 2026