MX records - why senders still need them
MX is for inbound, but cold senders without MX get penalised anyway.
On this page · 2
- Why senders need MX
- The Inboxlee default
MX records tell the world where to deliver mail addressed to your domain. For a sender-only domain, operators sometimes skip MX entirely. That is a mistake.
Why senders need MX
Bounces, auto-replies, and DMARC reports all return to the From address. Without MX, those messages disappear. You lose the bounce signal that warmup tools rely on, the unsubscribe-loop reply path, and the DMARC report stream.
Worse, missing MX is itself a deliverability signal. Mailbox providers see a domain with SPF and DKIM but no MX as a one-way blast cannon. They notice.
The Inboxlee default
Every domain we provision ships with the full Google Workspace MX stack - five records, correct priorities, no manual editing:
1 ASPMX.L.GOOGLE.COM 5 ALT1.ASPMX.L.GOOGLE.COM 5 ALT2.ASPMX.L.GOOGLE.COM 10 ALT3.ASPMX.L.GOOGLE.COM 10 ALT4.ASPMX.L.GOOGLE.COM
The mailbox is real, replies route to a real inbox, and bounces return cleanly. This is non-negotiable for a credible sending domain.