v0.5.1

0.5.1 (2026-05-22)

Bug Fixes

• dispatcher: stop Nak-redelivery hot loop on permanent stat errors (#396) (98c5cd0)
• pool: race-safe claims with FOR UPDATE SKIP LOCKED (#384) (6734790), closes #374
• security: tenant isolation in mailer API (#386) (bf63ee1)
• smtp: guard null-MX domain in Send to avoid nil panic (#379) (#387) (cd39628)