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Types: topic_id's unsubscribe link only comes with a send to one contact - #9

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heliocosta-dev merged 1 commit into
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fix/topic-id-docstring
Oct 21, 2026
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heliocosta-dev merged 1 commit into
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fix/topic-id-docstring

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The API generates the List-Unsubscribe pair and fills {{{UNSUBSCRIBE_URL}}} on a topic send only when it goes to a single address that is a contact. Every to, cc and bcc copy is the same message, so a shared link would let co-recipients opt that person out (MillionSend/millionsend#172). The topic id's docstring said the link was always added; it now says when it is. Docs only: no code or behavior change.

🤖 Generated with Claude Code

The API generates the List-Unsubscribe pair and fills
{{{UNSUBSCRIBE_URL}}} on a topic send only when it goes to a single
address that is a contact; every to, cc and bcc copy is the same message
(MillionSend/millionsend#172). The topic_id docstring said the link was
always added.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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heliocosta-dev merged commit b232df1 into main Oct 21, 2026
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heliocosta-dev deleted the fix/topic-id-docstring branch October 21, 2026 13:56
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