Email redirects to itself is either the user sent an email to himself or herself, or another user within the same domain.
https://files.mastodon.social/media_attachments/files/112/270/370/044/503/911/original/35602fdd2d00a4a9.jpeg
@nixCraft email does not just mean sending letters or postcards, but also sending DOC/XLS/PPT/PDF files or photo albums.
We send emails within the same domain, whereas emails are meant for inter-domain interaction...
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