chendeben/MailSend @ f0d4b04b52085850a22479305479e1d5dd23694a

chendeben f0d4b04b52 docs: add delivery webhooks implementation plan		3 сар өмнө
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plans	f0d4b04b52 docs: add delivery webhooks implementation plan	3 сар өмнө
specs	2d0d2118bd docs: pin webhook payload transaction and attempt counting	3 сар өмнө