Sometimes, Substack publishers go on vacation, take a hiatus, or are otherwise unable to publish something new. Hopefully, they've informed you of their plans beforehand. If you haven't received anything in awhile, you can always reach out to them by replying to the last email you received or send them an email to their Substack email address.
To get in touch with a writer, you can email them at [subdomain]@substack.com. Just replace 'subdomain' with the name of their publication.
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