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gh-40889: Fix email.utils.parseaddr on multiple intermediate route hops - #160775
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StanFromIreland
marked this pull request as draft
October 28, 2026 09:45
harisawan-bit
marked this pull request as ready for review
October 28, 2026 17:49
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Fixes gh-40889.
Summary of Changes
When \�mail.utils.parseaddr\ parses addresses containing obsolete route syntax with multiple hops (e.g. <@hop1.org,@hop2.org:foo@bar.com>), the parser fails on the comma delimiter and falls through into treating it as an invalid addrspec. Per RFC 5322 Section 4.4 (\obs-route), intermediate hops in a route address may be separated by commas.
This patch adds comma handling to \getrouteaddr()\ in \Lib/email/_parseaddr.py\ so that multi-hop route addresses resolve cleanly to the target mailbox. Regression tests added to \Lib/test/test_email/test_email.py\ and news entry added.