Which DNS you check: When e-mails does not arrive to it's intended mailbox. Assuming that sender and receiver are operating normally. Sender is an ISP so their routing is counted-for up-to next BGP or Exchange point. Destination is major e-mail provider with its own domains.
or may someone elaborate on current email routing practice used to rout mail between mail-servers located at different autonomous systems.
For those advocate for off-topic:
The issue beyond this question is a real life internet incident where ADSL subscription confirmation email doesn't arrive to subscriber. ISP won't confirm beyond sending. Mail provider forum won't specify specifics. Confirmation email arrived once e-mail provider changed. User needs to troubleshoot himself.
Whether it involve DNS hijacking, Miss-configured routing, Man-in-the-Middle, or E-mail Server Security. These topics has been featured at this forum without being considered as off-topic.
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