#151 MXA-check on not needed subdomain

[Pascal Nobus]

I got a mail blocked because bad MXA, however the lookup is on a record that is not used.
Sender was ....@in.out.onfact.be, assp reported:

• MX missing (cache): out.onfact.be (From)
• A record missing for MX: out.onfact.be (From)
  That is OK, but why is this check done?

onfact.be has got A and MX
in.out.onfact.be has got a valid MX (feedback-smtp.eu-west-1.amazonses.com)

[Thomas Eckardt]

the domain 'out.onfact.be' was used in the 'From:' header line, like
user@out.onfact.be

every address used in
From|ReturnReceipt|Return-Receipt-To|Disposition-Notification-To|Return-Path|Reply-To|Sender|Errors-To|List-....

is checked for a valid MX and the MX for an A record

RTM - Validate MX and A Record (DoDomainCheck)

Thomas