How to fix MAIL FROM

You got custom MAIL FROM MX/SPF is incomplete. Lumail sends with a custom MAIL FROM of ses.your-domain.com. That hostname needs its own MX and SPF. Without them, bounce handling and SPF alignment break.

What to add

Copy the MAIL FROM rows from Domains → the domain. They look like this:

Type	Host	Value
MX	ses.your-domain.com	feedback-smtp.REGION.amazonses.com (priority 10)
TXT	ses.your-domain.com	v=spf1 include:amazonses.com ~all

The MX target is region-specific. Use the value on the domain page, not a guess.

Checklist

• Host is ses relative to the sending domain (so ses.hey.melvynx.com if you send from hey.melvynx.com).
• MX priority is 10.
• SPF is a TXT on the same ses hostname, not only on the apex.
• No extra MX on ses.your-domain.com that steals the name.

Then verify on the domain page.

Related

• How to verify a sending domain
• Email Domains