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SendGrid: When several same `to` requested, only one message send.

This is memo.

Using service

Purpose

  • Request serveral same to
  • Send message to each to

That i do

  • use x-smtpapi header set To, Substitution, and Unique Arguments
  • x-smtpapi has set as like below
    { "to": [ "foo@example.com", "foo@example.com" ] }
    { "sub": { "%name%": ["John", "Paul"] } }
    { "unique_args": {"key": "%name%" } }
  • Text has set as like below
    This is mail. Your name is %name%.

Results

  • Only one message has sent. Why???

Action

  • When same to appeared, send request by other session

OWARI.